pyroxene

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Wyomingite (Pleistocene, 950-960 ka; Zirkel Mesa, Leucite Hills, Wyoming, USA) 56
by James St. John

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/48965629401.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48965629401_cab9dd2d24_m.jpg" alt="" /></a><br />Wyomingite (Pleistocene, 950-960 ka; Zirkel Mesa, Leucite Hills, Wyoming, USA) 56 / James St. John</span>

サイズ変更など

Lake Superior rocky shoreline (Split Rock Lighthouse, Minnesota, USA) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/22432482803.html" target="_blank"><img src="http://farm1.static.flickr.com/696/22432482803_f48cc62e14_m.jpg" alt="" /></a><br />Lake Superior rocky shoreline (Split Rock Lighthouse, Minnesota, USA) 2 / James St. John</span>

サイズ変更など

Peridotite mantle xenoliths in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 22
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51968774165.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51968774165_c6bed882b1_m.jpg" alt="" /></a><br />Peridotite mantle xenoliths in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 22 / James St. John</span>

サイズ変更など

Ordinary chondrite (New Concord Meteorite) 6
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/46808778024.html" target="_blank"><img src="http://farm8.static.flickr.com/7818/46808778024_616524e0cf_m.jpg" alt="" /></a><br />Ordinary chondrite (New Concord Meteorite) 6 / James St. John</span>

サイズ変更など

Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 19
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/45894550925.html" target="_blank"><img src="http://farm5.static.flickr.com/4842/45894550925_c3d9222b23_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 19 / James St. John</span>

サイズ変更など

Basalt (Newark Supergroup, Lower Jurassic; Somerset County, New Jersey, USA) 6
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52686914440.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52686914440_bea35d251c_m.jpg" alt="" /></a><br />Basalt (Newark Supergroup, Lower Jurassic; Somerset County, New Jersey, USA) 6 / James St. John</span>

サイズ変更など

Anorthosite (Poe Mountain Anorthosite, Mesoproterozoic, 1.43 Ga; Sybille Canyon, Laramie Range, Wyoming, USA) 7
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/31930953175.html" target="_blank"><img src="http://farm1.static.flickr.com/686/31930953175_cf4b1679a5_m.jpg" alt="" /></a><br />Anorthosite (Poe Mountain Anorthosite, Mesoproterozoic, 1.43 Ga; Sybille Canyon, Laramie Range, Wyoming, USA) 7 / James St. John</span>

サイズ変更など

Peridotite mantle xenoliths in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 36
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51968256441.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51968256441_aaaa26c2f8_m.jpg" alt="" /></a><br />Peridotite mantle xenoliths in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 36 / James St. John</span>

サイズ変更など

Bastite (apparently) (Neoarchean; Red Lodge Chromite District, Beartooth Mountains, Montana, USA) 1
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52574717741.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52574717741_dca2d2c56f_m.jpg" alt="" /></a><br />Bastite (apparently) (Neoarchean; Red Lodge Chromite District, Beartooth Mountains, Montana, USA) 1 / James St. John</span>

サイズ変更など

Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 17
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/46084752094.html" target="_blank"><img src="http://farm5.static.flickr.com/4864/46084752094_edb444405b_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 17 / James St. John</span>

サイズ変更など

Basalt (Newark Supergroup, Lower Jurassic; Somerset County, New Jersey, USA) 7
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52686914460.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52686914460_5bfcd0429c_m.jpg" alt="" /></a><br />Basalt (Newark Supergroup, Lower Jurassic; Somerset County, New Jersey, USA) 7 / James St. John</span>

サイズ変更など

Basalt (McCartys Flow, Holocene, ~2.4 to 3.9 ka; southeast of Grants, New Mexico, USA) 18
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52770757777.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52770757777_b84728a71c_m.jpg" alt="" /></a><br />Basalt (McCartys Flow, Holocene, ~2.4 to 3.9 ka; southeast of Grants, New Mexico, USA) 18 / James St. John</span>

サイズ変更など

Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 22
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/46091701544.html" target="_blank"><img src="http://farm5.static.flickr.com/4857/46091701544_7965717d45_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 22 / James St. John</span>

サイズ変更など

Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 26
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/49992553866.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49992553866_1645e4c3df_m.jpg" alt="" /></a><br />Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 26 / James St. John</span>

サイズ変更など

Actinolite xenolith in sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 12
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/48343322437.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48343322437_7c9c86683b_m.jpg" alt="" /></a><br />Actinolite xenolith in sandorite lamprophyre (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 12 / James St. John</span>

サイズ変更など

Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 8
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/47926800887.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/47926800887_38a2447370_m.jpg" alt="" /></a><br />Monchiquite lamprophyre dike (Precambrian; Michipicoten River Bridge South roadcut, south of Wawa, Ontario, Canada) 8 / James St. John</span>

サイズ変更など

Aphyric & partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 8
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/32933853308.html" target="_blank"><img src="http://farm8.static.flickr.com/7926/32933853308_ef3bc6cefc_m.jpg" alt="" /></a><br />Aphyric & partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 8 / James St. John</span>

サイズ変更など

Eclogite (Late Silurian to Early Devonian, ~400-423 Ma; Almenningen, Vestland, Norway) 9
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/53363684115.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/53363684115_c0d07c9746_m.jpg" alt="" /></a><br />Eclogite (Late Silurian to Early Devonian, ~400-423 Ma; Almenningen, Vestland, Norway) 9 / James St. John</span>

サイズ変更など

Inch-scale layering of plagioclase feldspar and pyroxene (Stillwater Complex, Neoarchean, 2.71 Ga; near the Stillwater Mine, Beartooth Mountains, Montana, USA) 39
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52365761804.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52365761804_142f91a495_m.jpg" alt="" /></a><br />Inch-scale layering of plagioclase feldspar and pyroxene (Stillwater Complex, Neoarchean, 2.71 Ga; near the Stillwater Mine, Beartooth Mountains, Montana, USA) 39 / James St. John</span>

サイズ変更など

Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 16
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/32933896978.html" target="_blank"><img src="http://farm8.static.flickr.com/7866/32933896978_51d6a806d6_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 16 / James St. John</span>

サイズ変更など

Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 26
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/46816696251.html" target="_blank"><img src="http://farm8.static.flickr.com/7859/46816696251_57275dbf9c_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 26 / James St. John</span>

サイズ変更など

Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 20
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/32933848108.html" target="_blank"><img src="http://farm8.static.flickr.com/7823/32933848108_984d95317b_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 20 / James St. John</span>

サイズ変更など

Llao Rock (Crater Lake Caldera, Oregon, USA) 25
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/28155947118.html" target="_blank"><img src="http://farm1.static.flickr.com/976/28155947118_1b0786c875_m.jpg" alt="" /></a><br />Llao Rock (Crater Lake Caldera, Oregon, USA) 25 / James St. John</span>

サイズ変更など

Anorthosite-nelsonite (Poe Mountain Anorthosite, Mesoproterozoic, 1.431-1.436 Ga; Sybille Canyon, Laramie Range, Wyoming, USA) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/48679786528.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48679786528_9c48ae7e71_m.jpg" alt="" /></a><br />Anorthosite-nelsonite (Poe Mountain Anorthosite, Mesoproterozoic, 1.431-1.436 Ga; Sybille Canyon, Laramie Range, Wyoming, USA) 3 / James St. John</span>

サイズ変更など

Llao Rock (Crater Lake Caldera, Oregon, USA) 24
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/28155964598.html" target="_blank"><img src="http://farm1.static.flickr.com/948/28155964598_0ce584dab8_m.jpg" alt="" /></a><br />Llao Rock (Crater Lake Caldera, Oregon, USA) 24 / James St. John</span>

サイズ変更など

Basaltic lava flow top 4
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52882172824.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52882172824_7e80594408_m.jpg" alt="" /></a><br />Basaltic lava flow top 4 / James St. John</span>

サイズ変更など

Basalt (Newark Supergroup, Lower Jurassic; Somerset County, New Jersey, USA) 10
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52685971842.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52685971842_05116c1b41_m.jpg" alt="" /></a><br />Basalt (Newark Supergroup, Lower Jurassic; Somerset County, New Jersey, USA) 10 / James St. John</span>

サイズ変更など

Chromian diopside (Almklovdalen Peridotite, Precambrian; Gusdal Olivine Pit, near Åheim, Norway) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/50622661712.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50622661712_87906c7400_m.jpg" alt="" /></a><br />Chromian diopside (Almklovdalen Peridotite, Precambrian; Gusdal Olivine Pit, near Åheim, Norway) 3 / James St. John</span>

サイズ変更など

Calc-silicate rocks & reaction rim with metabentonite (Gouverneur Marble, Mesoproterozoic, ~1.1 Ga; Route 11 roadcut southwest of Canton, New York State, USA) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/49908510698.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49908510698_92a7a8c968_m.jpg" alt="" /></a><br />Calc-silicate rocks & reaction rim with metabentonite (Gouverneur Marble, Mesoproterozoic, ~1.1 Ga; Route 11 roadcut southwest of Canton, New York State, USA) 2 / James St. John</span>

サイズ変更など

Anorthosite (Lac St. Jean Anorthosite Complex, Mesoproterozoic, 1140-1157 Ma; Lake St-Jean, Quebec, Canada) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/50421616221.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50421616221_75f54be3e8_m.jpg" alt="" /></a><br />Anorthosite (Lac St. Jean Anorthosite Complex, Mesoproterozoic, 1140-1157 Ma; Lake St-Jean, Quebec, Canada) 2 / James St. John</span>

サイズ変更など

Anorthosite (Poe Mountain Anorthosite, Mesoproterozoic, 1.43 Ga; Sybille Canyon area, Laramie Range, Wyoming, USA) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51143004861.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51143004861_cefb156e63_m.jpg" alt="" /></a><br />Anorthosite (Poe Mountain Anorthosite, Mesoproterozoic, 1.43 Ga; Sybille Canyon area, Laramie Range, Wyoming, USA) 3 / James St. John</span>

サイズ変更など

Layered gabbros (troctolitic series, Duluth Complex, Mesoproterozoic, 1099 Ma; Thomson Hill Information Center Outcrop, Skyline Parkway, Duluth, Minnesota, USA) 7
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/21454355419.html" target="_blank"><img src="http://farm6.static.flickr.com/5693/21454355419_fa77cc1b1f_m.jpg" alt="" /></a><br />Layered gabbros (troctolitic series, Duluth Complex, Mesoproterozoic, 1099 Ma; Thomson Hill Information Center Outcrop, Skyline Parkway, Duluth, Minnesota, USA) 7 / James St. John</span>

サイズ変更など

Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 4
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/49979655342.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49979655342_fdcb867c23_m.jpg" alt="" /></a><br />Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 4 / James St. John</span>

サイズ変更など

Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 21
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/32940958968.html" target="_blank"><img src="http://farm8.static.flickr.com/7862/32940958968_5f1e9d5baa_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 21 / James St. John</span>

サイズ変更など

Rhyodacite lava & pumice-fall deposit (Holocene, ~7.8 to 7.9 ka; eastern flanks of Llao Rock, Crater Lake Caldera, Oregon, USA) 1
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/40221501290.html" target="_blank"><img src="http://farm1.static.flickr.com/961/40221501290_2ba599fe68_m.jpg" alt="" /></a><br />Rhyodacite lava & pumice-fall deposit (Holocene, ~7.8 to 7.9 ka; eastern flanks of Llao Rock, Crater Lake Caldera, Oregon, USA) 1 / James St. John</span>

サイズ変更など

Gabbro (troctolitic series, Duluth Complex, Mesoproterozoic, 1099 Ma; Thomson Hill Information Center Outcrop, Skyline Parkway, Duluth, Minnesota, USA) 1
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/21453318000.html" target="_blank"><img src="http://farm1.static.flickr.com/674/21453318000_3853e9beb0_m.jpg" alt="" /></a><br />Gabbro (troctolitic series, Duluth Complex, Mesoproterozoic, 1099 Ma; Thomson Hill Information Center Outcrop, Skyline Parkway, Duluth, Minnesota, USA) 1 / James St. John</span>

サイズ変更など

Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 9
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/49979706492.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49979706492_6091079f97_m.jpg" alt="" /></a><br />Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 9 / James St. John</span>

サイズ変更など

Lake Superior rocky shoreline (Split Rock Lighthouse, Minnesota, USA) 1
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/22430890954.html" target="_blank"><img src="http://farm1.static.flickr.com/577/22430890954_a093f6c0de_m.jpg" alt="" /></a><br />Lake Superior rocky shoreline (Split Rock Lighthouse, Minnesota, USA) 1 / James St. John</span>

サイズ変更など

Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 12
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/48931575421.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931575421_8ef43c6e07_m.jpg" alt="" /></a><br />Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 12 / James St. John</span>

サイズ変更など

Minette dike & volcanic neck (Oligocene, 27-32 Ma; Ship Rock & southern dike, Navajo Volcanic Field, New Mexico, USA) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/8358792321.html" target="_blank"><img src="http://farm9.static.flickr.com/8080/8358792321_f2f622f008_m.jpg" alt="" /></a><br />Minette dike & volcanic neck (Oligocene, 27-32 Ma; Ship Rock & southern dike, Navajo Volcanic Field, New Mexico, USA) 3 / James St. John</span>

サイズ変更など

Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 10
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/49979705867.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49979705867_786eb25c87_m.jpg" alt="" /></a><br />Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 10 / James St. John</span>

サイズ変更など

Peridotite mantle xenolith in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 23
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51967206547.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51967206547_c9732e77ea_m.jpg" alt="" /></a><br />Peridotite mantle xenolith in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 23 / James St. John</span>

サイズ変更など

Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 4
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/48931717251.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931717251_b65df1279a_m.jpg" alt="" /></a><br />Madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 4 / James St. John</span>

サイズ変更など

Gabbro (troctolitic series, Duluth Complex, Mesoproterozoic, 1099 Ma; Thomson Hill Information Center Outcrop, Skyline Parkway, Duluth, Minnesota, USA) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/21629905482.html" target="_blank"><img src="http://farm6.static.flickr.com/5727/21629905482_d1f378151f_m.jpg" alt="" /></a><br />Gabbro (troctolitic series, Duluth Complex, Mesoproterozoic, 1099 Ma; Thomson Hill Information Center Outcrop, Skyline Parkway, Duluth, Minnesota, USA) 2 / James St. John</span>

サイズ変更など

Basalt (Newark Supergroup, Lower Jurassic; Somerset County, New Jersey, USA) 4
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52686769324.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52686769324_3e7f56b4bd_m.jpg" alt="" /></a><br />Basalt (Newark Supergroup, Lower Jurassic; Somerset County, New Jersey, USA) 4 / James St. John</span>

サイズ変更など

Anorthosite (Ankafotia Anorthosite Massif, Neoproterozoic, ~660 Ma; Madagascar) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/50421677122.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50421677122_83b04d0793_m.jpg" alt="" /></a><br />Anorthosite (Ankafotia Anorthosite Massif, Neoproterozoic, ~660 Ma; Madagascar) 2 / James St. John</span>

サイズ変更など

Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 24
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/39851425373.html" target="_blank"><img src="http://farm8.static.flickr.com/7923/39851425373_a4f0ebf3d7_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 24 / James St. John</span>

サイズ変更など

Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 15
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/49979702242.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49979702242_9f61a3a3dd_m.jpg" alt="" /></a><br />Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 15 / James St. John</span>

サイズ変更など

Anorthosite (Poe Mountain Anorthosite, Mesoproterozoic, 1.43 Ga; Sybille Canyon, Laramie Range, Wyoming, USA) 6
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/31930964215.html" target="_blank"><img src="http://farm1.static.flickr.com/601/31930964215_9c5456d955_m.jpg" alt="" /></a><br />Anorthosite (Poe Mountain Anorthosite, Mesoproterozoic, 1.43 Ga; Sybille Canyon, Laramie Range, Wyoming, USA) 6 / James St. John</span>

サイズ変更など

Bastite (apparently) (Neoarchean; Red Lodge Chromite District, Beartooth Mountains, Montana, USA) 5
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52574722416.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52574722416_f019cc7ec4_m.jpg" alt="" /></a><br />Bastite (apparently) (Neoarchean; Red Lodge Chromite District, Beartooth Mountains, Montana, USA) 5 / James St. John</span>

サイズ変更など

Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 27
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/46091649264.html" target="_blank"><img src="http://farm5.static.flickr.com/4867/46091649264_224a652122_m.jpg" alt="" /></a><br />Partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 27 / James St. John</span>

サイズ変更など

Gabbro (Duluth Complex, Mesoproterozoic, 1099 Ma; Rt. 1 roadcut between Heart Lake & Little Spring Lake, Minnesota, USA) 1
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/20831810003.html" target="_blank"><img src="http://farm6.static.flickr.com/5740/20831810003_9acc5f3892_m.jpg" alt="" /></a><br />Gabbro (Duluth Complex, Mesoproterozoic, 1099 Ma; Rt. 1 roadcut between Heart Lake & Little Spring Lake, Minnesota, USA) 1 / James St. John</span>

サイズ変更など

Peridotite mantle xenoliths in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 33
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51968822405.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51968822405_4aedb7f1bc_m.jpg" alt="" /></a><br />Peridotite mantle xenoliths in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 33 / James St. John</span>

サイズ変更など

Basalt & scoriaceous basalt (near Klamath Falls, Oregon, USA)
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52188881565.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52188881565_2d1f6a8ec1_m.jpg" alt="" /></a><br />Basalt & scoriaceous basalt (near Klamath Falls, Oregon, USA) / James St. John</span>

サイズ変更など

Obsidian & devitrified obsidian gravel (Obsidian Cliff, Yellowstone, Wyoming, USA) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/46817146971.html" target="_blank"><img src="http://farm8.static.flickr.com/7819/46817146971_bf8221a652_m.jpg" alt="" /></a><br />Obsidian & devitrified obsidian gravel (Obsidian Cliff, Yellowstone, Wyoming, USA) 3 / James St. John</span>

サイズ変更など

Pumiceous orendite lamproite (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 12
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/48981558697.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48981558697_4f2f378bd0_m.jpg" alt="" /></a><br />Pumiceous orendite lamproite (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 12 / James St. John</span>

サイズ変更など

Anorthosite (Poe Mountain Anorthosite, Mesoproterozoic, 1.43 Ga; Sybille Canyon, Laramie Range, Wyoming, USA) 1
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/31091327364.html" target="_blank"><img src="http://farm1.static.flickr.com/751/31091327364_3a3ed223b9_m.jpg" alt="" /></a><br />Anorthosite (Poe Mountain Anorthosite, Mesoproterozoic, 1.43 Ga; Sybille Canyon, Laramie Range, Wyoming, USA) 1 / James St. John</span>

サイズ変更など

Yooperlite (sodalite syenite) (Lake Superior shoreline, Upper Peninsula of Michigan, USA) 9
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52948891256.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52948891256_bf04e1d3af_m.jpg" alt="" /></a><br />Yooperlite (sodalite syenite) (Lake Superior shoreline, Upper Peninsula of Michigan, USA) 9 / James St. John</span>

サイズ変更など

Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 10
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/48931039093.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48931039093_ac21ccf774_m.jpg" alt="" /></a><br />Pilot Butte (Pliocene madupite lamproite volcanic center in the Leucite Hills, Wyoming, USA) 10 / James St. John</span>

サイズ変更など

Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 7
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/49978921228.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49978921228_0711a922f9_m.jpg" alt="" /></a><br />Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 7 / James St. John</span>

サイズ変更など

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