mafic

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Mahogany obsidian (Tertiary, 5.03-7.7 Ma; Glass Buttes, Oregon, USA) 3
by James St. John

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51524807608.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51524807608_de3fe557e6_m.jpg" alt="" /></a><br />Mahogany obsidian (Tertiary, 5.03-7.7 Ma; Glass Buttes, Oregon, USA) 3 / James St. John</span>

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Hyalite opal on vesicular porphyritic leucite tephrite (Doupov Volcanic Complex, Oligocene to Lower Miocene; hills of the Doupov Mountains, north or west of Valec (Waltsch), northwestern Bohemia) 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/15143283742.html" target="_blank"><img src="http://farm4.static.flickr.com/3849/15143283742_a9bf42bfbb_m.jpg" alt="" /></a><br />Hyalite opal on vesicular porphyritic leucite tephrite (Doupov Volcanic Complex, Oligocene to Lower Miocene; hills of the Doupov Mountains, north or west of Valec (Waltsch), northwestern Bohemia) 2 / James St. John</span>

サイズ変更など

Pisolitic bauxite (mine near Boddington, Western Australia) 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/52799273654.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52799273654_0d5f6ec357_m.jpg" alt="" /></a><br />Pisolitic bauxite (mine near Boddington, Western Australia) 1 / James St. John</span>

サイズ変更など

Pikes Peak Granite (Mesoproterozoic, 1.08 Ga; Ute Trail, Manitou Springs, Colorado, 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/49267612633.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49267612633_23ebcf7d55_m.jpg" alt="" /></a><br />Pikes Peak Granite (Mesoproterozoic, 1.08 Ga; Ute Trail, Manitou Springs, Colorado, USA) 9 / James St. John</span>

サイズ変更など

Verde Bamboo Granite (epidotic metasandstone) (Ipuçaba Formation, Mesoproterozoic, 1.6-1.7 Ga; Bahia, Brazil) 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/34181833844.html" target="_blank"><img src="http://farm5.static.flickr.com/4204/34181833844_49c6a06075_m.jpg" alt="" /></a><br />Verde Bamboo Granite (epidotic metasandstone) (Ipuçaba Formation, Mesoproterozoic, 1.6-1.7 Ga; Bahia, Brazil) 1 / James St. John</span>

サイズ変更など

Gabbro (Stillwater Complex, Neoarchean, 2.71 Ga; Stillwater County, Montana, 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/49951216382.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49951216382_0efa1593e4_m.jpg" alt="" /></a><br />Gabbro (Stillwater Complex, Neoarchean, 2.71 Ga; Stillwater County, Montana, USA) / James St. John</span>

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Porphyritic phonolite (Cripple Creek Diatreme, Early Oligocene, 32 Ma; Ironclad area, Cripple Creek Mining District, Colorado, 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/49241003773.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49241003773_04f3ffab9e_m.jpg" alt="" /></a><br />Porphyritic phonolite (Cripple Creek Diatreme, Early Oligocene, 32 Ma; Ironclad area, Cripple Creek Mining District, Colorado, USA) 3 / James St. John</span>

サイズ変更など

Splintery obsidian (10 to 15 miles north of Chiloquin, 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/16743245746.html" target="_blank"><img src="http://farm9.static.flickr.com/8738/16743245746_ac8db0db3f_m.jpg" alt="" /></a><br />Splintery obsidian (10 to 15 miles north of Chiloquin, Oregon, USA) 1 / James St. John</span>

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Sulfidic tremolitite (platinum-palladium ore) (Johns-Manville Reef, Stillwater Complex, Neoarchean, 2.71 Ga; Stillwater Mine, Beartooth Mountains, Montana, 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/14828814031.html" target="_blank"><img src="http://farm4.static.flickr.com/3913/14828814031_873f55a624_m.jpg" alt="" /></a><br />Sulfidic tremolitite (platinum-palladium ore) (Johns-Manville Reef, Stillwater Complex, Neoarchean, 2.71 Ga; Stillwater Mine, Beartooth Mountains, Montana, USA) / James St. John</span>

サイズ変更など

Litli Hrútur eruption, Iceland (morning, 19 July 2023) 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/53057403290.html" target="_blank"><img src="http://farm0.static.flickr.com/0/53057403290_efb9b0c872_m.jpg" alt="" /></a><br />Litli Hrútur eruption, Iceland (morning, 19 July 2023) 1 / James St. John</span>

サイズ変更など

Massive sulfide (Pt/Pd-rich chalcopyrite-pyrrhotite) (platinum-palladium ore) (Johns-Manville Reef, Stillwater Complex, Neoarchean, 2.71 Ga; Stillwater Mine, Beartooth Mountains, Montana, 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/14828836401.html" target="_blank"><img src="http://farm4.static.flickr.com/3924/14828836401_5a5b57040b_m.jpg" alt="" /></a><br />Massive sulfide (Pt/Pd-rich chalcopyrite-pyrrhotite) (platinum-palladium ore) (Johns-Manville Reef, Stillwater Complex, Neoarchean, 2.71 Ga; Stillwater Mine, Beartooth Mountains, Montana, USA) / James St. John</span>

サイズ変更など

Lazurite in pyritic marble (Sakhi Formation, Neoarchean; Sar-e-Sang Deposit, Kokcha Valley, Hindu Kush Mountains, Afghanistan)
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/29807269083.html" target="_blank"><img src="http://farm6.static.flickr.com/5734/29807269083_ae62a7b48e_m.jpg" alt="" /></a><br />Lazurite in pyritic marble (Sakhi Formation, Neoarchean; Sar-e-Sang Deposit, Kokcha Valley, Hindu Kush Mountains, Afghanistan) / James St. John</span>

サイズ変更など

Metatuff (Cranberry Island Series, Upper Silurian, 424 Ma; Seawall Beach, Mt. Desert Island, Maine, USA) 11
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/50081681773.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50081681773_a89c1224d7_m.jpg" alt="" /></a><br />Metatuff (Cranberry Island Series, Upper Silurian, 424 Ma; Seawall Beach, Mt. Desert Island, Maine, USA) 11 / James St. John</span>

サイズ変更など

Spinifex metakomatiite (serpentinite) (Upper Komatiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711-2.717 Ga; Pyke Hill, Ontario, 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/14838653330.html" target="_blank"><img src="http://farm4.static.flickr.com/3888/14838653330_aa47b98142_m.jpg" alt="" /></a><br />Spinifex metakomatiite (serpentinite) (Upper Komatiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711-2.717 Ga; Pyke Hill, Ontario, Canada) 2 / 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) 78
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/52375675268.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52375675268_b9c7f5e0fd_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) 78 / James St. John</span>

サイズ変更など

Gray obsidian 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/50968263411.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50968263411_3a711144cd_m.jpg" alt="" /></a><br />Gray obsidian 5 / James St. John</span>

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Obsidian 34
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/51479636297.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51479636297_85384129b9_m.jpg" alt="" /></a><br />Obsidian 34 / James St. John</span>

サイズ変更など

Ordinary chondrite (Viñales Meteorite) 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/50438632808.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50438632808_051153d98f_m.jpg" alt="" /></a><br />Ordinary chondrite (Viñales Meteorite) 21 / James St. John</span>

サイズ変更など

Ordinary chondrite (Pricetown Meteorite) 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/52322071037.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52322071037_0170c7fe8f_m.jpg" alt="" /></a><br />Ordinary chondrite (Pricetown Meteorite) 1 / James St. John</span>

サイズ変更など

Obsidian & devitrified obsidian gravel (Obsidian Cliff, Yellowstone, 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/45902134895.html" target="_blank"><img src="http://farm5.static.flickr.com/4815/45902134895_fc4bc605f7_m.jpg" alt="" /></a><br />Obsidian & devitrified obsidian gravel (Obsidian Cliff, Yellowstone, Wyoming, USA) 1 / James St. John</span>

サイズ変更など

Chromitic dunite (Stillwater Complex, Neoarchean, 2.71 Ga; Beartooth Mountains, Montana, 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/50861157283.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50861157283_5922fa9102_m.jpg" alt="" /></a><br />Chromitic dunite (Stillwater Complex, Neoarchean, 2.71 Ga; Beartooth Mountains, Montana, USA) 7 / James St. John</span>

サイズ変更など

Sulfidic basaltic lapillistone (copper ore) (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711 to 2.719 Ga; Potter Mine, east of Timmins, 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/49938767918.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49938767918_03a4bd052c_m.jpg" alt="" /></a><br />Sulfidic basaltic lapillistone (copper ore) (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711 to 2.719 Ga; Potter Mine, east of Timmins, Ontario, Canada) 8 / James St. John</span>

サイズ変更など

Ordinary chondrite (Viñales Meteorite) 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/50438633278.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50438633278_f16d444e2e_m.jpg" alt="" /></a><br />Ordinary chondrite (Viñales Meteorite) 25 / James St. John</span>

サイズ変更など

Spinifex metakomatiite (serpentinite) (Upper Komatiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711-2.717 Ga; Pyke Hill, Ontario, Canada) 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/15024945542.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/15024945542_6b68847901_m.jpg" alt="" /></a><br />Spinifex metakomatiite (serpentinite) (Upper Komatiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711-2.717 Ga; Pyke Hill, Ontario, Canada) 1 / James St. John</span>

サイズ変更など

Pebbles in Time
by the real Kam75

クリエイティブ・コモンズ表示-継承 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/17051763457.html" target="_blank"><img src="http://farm8.static.flickr.com/7590/17051763457_8b53f97476_m.jpg" alt="" /></a><br />Pebbles in Time / the real Kam75</span>

サイズ変更など

End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Bake Oven Pothole, Interstate State Park, Taylors Falls, Minnesota, 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/23127387443.html" target="_blank"><img src="http://farm6.static.flickr.com/5629/23127387443_b44d3707ff_m.jpg" alt="" /></a><br />End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Bake Oven Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 10 / James St. John</span>

サイズ変更など

Ordinary chondrite (Park Forest Meteorite) 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/14780739165.html" target="_blank"><img src="http://farm3.static.flickr.com/2923/14780739165_00db5cd1d9_m.jpg" alt="" /></a><br />Ordinary chondrite (Park Forest Meteorite) 3 / James St. John</span>

サイズ変更など

Andesite (near Belleville, Mineral County, Nevada, 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/16552085407.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/16552085407_01f6ff5a86_m.jpg" alt="" /></a><br />Andesite (near Belleville, Mineral County, Nevada, USA) 1 / James St. John</span>

サイズ変更など

Lamprophyre breccia (Cresson Pipe, Cripple Creek Diatreme, Early Oligocene, ~28.5 Ma; western side of Cresson Pit, Cripple Creek Mining District, Colorado, 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/49234129453.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49234129453_25bf956377_m.jpg" alt="" /></a><br />Lamprophyre breccia (Cresson Pipe, Cripple Creek Diatreme, Early Oligocene, ~28.5 Ma; western side of Cresson Pit, Cripple Creek Mining District, Colorado, USA) 2 / James St. John</span>

サイズ変更など

Spherulitic magnetite (Rudnogorsk Deposit, Angara-Ilim Iron Ore District, Irkutsk Region, Siberia, Russia) 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/50875003497.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50875003497_ed34b42b31_m.jpg" alt="" /></a><br />Spherulitic magnetite (Rudnogorsk Deposit, Angara-Ilim Iron Ore District, Irkutsk Region, Siberia, Russia) 1 / James St. John</span>

サイズ変更など

Granite
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/50994719867.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50994719867_6dd3320589_m.jpg" alt="" /></a><br />Granite / James St. John</span>

サイズ変更など

Chromitite (Stillwater Complex, Neoarchean, 2.71 Ga; Beartooth Mountains, Montana, 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/50433832672.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50433832672_aac8ffc2dd_m.jpg" alt="" /></a><br />Chromitite (Stillwater Complex, Neoarchean, 2.71 Ga; Beartooth Mountains, Montana, USA) 10 / James St. John</span>

サイズ変更など

Sulfidic basaltic lapillistone (copper ore) (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711 to 2.719 Ga; Potter Mine, east of Timmins, Ontario, Canada) 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/49939285081.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49939285081_ef8aeb92ff_m.jpg" alt="" /></a><br />Sulfidic basaltic lapillistone (copper ore) (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711 to 2.719 Ga; Potter Mine, east of Timmins, Ontario, Canada) 7 / James St. John</span>

サイズ変更など

Azul Bahia Granite (sodalite metasyenite, Itabuna Syenite Complex, Neoproterozoic, ~676 Ma; Fazenda Hiassu, Bahia State, Brazil) 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/14833303573.html" target="_blank"><img src="http://farm4.static.flickr.com/3895/14833303573_1f53f62fbf_m.jpg" alt="" /></a><br />Azul Bahia Granite (sodalite metasyenite, Itabuna Syenite Complex, Neoproterozoic, ~676 Ma; Fazenda Hiassu, Bahia State, Brazil) 1 / James St. John</span>

サイズ変更など

Chromitite (Stillwater Complex, Neoarchean, 2.71 Ga; 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/50432972533.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50432972533_c00a4b06cf_m.jpg" alt="" /></a><br />Chromitite (Stillwater Complex, Neoarchean, 2.71 Ga; Beartooth Mountains, Montana, USA) 5 / James St. John</span>

サイズ変更など

Lamprophyre breccia (Cresson Pipe, Cripple Creek Diatreme, Early Oligocene, ~28.5 Ma; western side of Cresson Pit, Cripple Creek Mining District, Colorado, 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/49234127893.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49234127893_38696460d1_m.jpg" alt="" /></a><br />Lamprophyre breccia (Cresson Pipe, Cripple Creek Diatreme, Early Oligocene, ~28.5 Ma; western side of Cresson Pit, Cripple Creek Mining District, Colorado, USA) 3 / James St. John</span>

サイズ変更など

Litli Hrútur eruption, Iceland (early morning, 11 July 2023) 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/53037328022.html" target="_blank"><img src="http://farm0.static.flickr.com/0/53037328022_6a98e64d38_m.jpg" alt="" /></a><br />Litli Hrútur eruption, Iceland (early morning, 11 July 2023) 1 / James St. John</span>

サイズ変更など

Sulfidic basaltic lapillistone (copper ore) (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711 to 2.719 Ga; Potter Mine, east of Timmins, Ontario, Canada) 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/49938769943.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49938769943_c03bde9183_m.jpg" alt="" /></a><br />Sulfidic basaltic lapillistone (copper ore) (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711 to 2.719 Ga; Potter Mine, east of Timmins, Ontario, Canada) 6 / James St. John</span>

サイズ変更など

Vesiculated tachylite (basaltic lava flow cross-section, 1969 to 1974 lava tube ceiling, Mauna Ulu Lava Field, East Rift Zone, Kilauea Volcano, Hawaii, 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/15025522485.html" target="_blank"><img src="http://farm4.static.flickr.com/3911/15025522485_4277a7696c_m.jpg" alt="" /></a><br />Vesiculated tachylite (basaltic lava flow cross-section, 1969 to 1974 lava tube ceiling, Mauna Ulu Lava Field, East Rift Zone, Kilauea Volcano, Hawaii, USA) 1 / 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) 93
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/52375776274.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52375776274_1015989e4a_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) 93 / James St. John</span>

サイズ変更など

Ordinary chondrite (Viñales Meteorite) 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/50439331111.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50439331111_1afbe72a15_m.jpg" alt="" /></a><br />Ordinary chondrite (Viñales Meteorite) 22 / James St. John</span>

サイズ変更など

Acapulcoite (North West Africa 2989 Meteorite) 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/14601736517.html" target="_blank"><img src="http://farm4.static.flickr.com/3901/14601736517_831dd1b72e_m.jpg" alt="" /></a><br />Acapulcoite (North West Africa 2989 Meteorite) 2 / James St. John</span>

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Quartz-gold hydrothermal vein rock (Neoarchean, 2.67 Ga; Hollinger Mine, Timmins, Ontario, Canada) 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/50930283363.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50930283363_8383ca5920_m.jpg" alt="" /></a><br />Quartz-gold hydrothermal vein rock (Neoarchean, 2.67 Ga; Hollinger Mine, Timmins, Ontario, Canada) 3 / James St. John</span>

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Basalt 11
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/48674617041.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/48674617041_4ec5ed528b_m.jpg" alt="" /></a><br />Basalt 11 / James St. John</span>

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Sulfidic gabbro (nickel ore) (Voisey's Bay Ni-Cu-Co Magmatic Sulfide Deposit, Mesoproterozoic, 1.333 Ga; Voisey's Bay Mine, Labrador, Canada) 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/49943337598.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49943337598_dd53c1738e_m.jpg" alt="" /></a><br />Sulfidic gabbro (nickel ore) (Voisey's Bay Ni-Cu-Co Magmatic Sulfide Deposit, Mesoproterozoic, 1.333 Ga; Voisey's Bay Mine, Labrador, Canada) 3 / James St. John</span>

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Lamprophyre breccia & lamprophyre dike (Cresson Pipe, Cripple Creek Diatreme, Early Oligocene, ~28.5 Ma; western side of Cresson Pit, Cripple Creek Mining District, Colorado, 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/49234110848.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49234110848_6fd4a3194e_m.jpg" alt="" /></a><br />Lamprophyre breccia & lamprophyre dike (Cresson Pipe, Cripple Creek Diatreme, Early Oligocene, ~28.5 Ma; western side of Cresson Pit, Cripple Creek Mining District, Colorado, USA) 7 / James St. John</span>

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Greenstone 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/16272258254.html" target="_blank"><img src="http://farm9.static.flickr.com/8723/16272258254_0afd40d580_m.jpg" alt="" /></a><br />Greenstone 1 / James St. John</span>

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Chromitite (Stillwater Complex, Neoarchean, 2.71 Ga; 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/14828778391.html" target="_blank"><img src="http://farm6.static.flickr.com/5555/14828778391_9712b32625_m.jpg" alt="" /></a><br />Chromitite (Stillwater Complex, Neoarchean, 2.71 Ga; Beartooth Mountains, Montana, USA) 1 / James St. John</span>

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Quartz-gold hydrothermal vein rock (Neoarchean, 2.67 Ga; Hollinger Mine, Timmins, Ontario, 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/50931092682.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50931092682_1ee03ed56a_m.jpg" alt="" /></a><br />Quartz-gold hydrothermal vein rock (Neoarchean, 2.67 Ga; Hollinger Mine, Timmins, Ontario, Canada) 2 / James St. John</span>

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Tholeiitic basalt dike with flow layering & peperite & basaltic lapillistone (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711-2.719 Ga; just east of the Potter Mine, east of Timmins, Ontario, Canada) 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/32916351997.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/32916351997_9ca12b1021_m.jpg" alt="" /></a><br />Tholeiitic basalt dike with flow layering & peperite & basaltic lapillistone (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711-2.719 Ga; just east of the Potter Mine, east of Timmins, Ontario, Canada) 1 / James St. John</span>

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Sundhnúkur Crater Row eruption, Iceland (10:03 to 10:05 AM, 1 April 2025)
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/54424197234.html" target="_blank"><img src="http://farm0.static.flickr.com/0/54424197234_0ef69caee4_m.jpg" alt="" /></a><br />Sundhnúkur Crater Row eruption, Iceland (10:03 to 10:05 AM, 1 April 2025) / James St. John</span>

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Hornblende gabbro (Salem Neck, Massachusetts, 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/51632819104.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51632819104_5c043aa7b1_m.jpg" alt="" /></a><br />Hornblende gabbro (Salem Neck, Massachusetts, USA) 2 / James St. John</span>

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End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, 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/23112733093.html" target="_blank"><img src="http://farm1.static.flickr.com/688/23112733093_3d4aca6fa2_m.jpg" alt="" /></a><br />End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 5 / James St. John</span>

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Obsidian 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/8455591803.html" target="_blank"><img src="http://farm9.static.flickr.com/8108/8455591803_2e00fcd2ca_m.jpg" alt="" /></a><br />Obsidian 1 / James St. John</span>

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Metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; large loose block at Ely visitor center, Ely, 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/21266582869.html" target="_blank"><img src="http://farm6.static.flickr.com/5651/21266582869_f9c9441aab_m.jpg" alt="" /></a><br />Metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; large loose block at Ely visitor center, Ely, Minnesota, USA) 7 / James St. John</span>

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Syenite (Cuttingsville Complex, mid-Cretaceous, 97 Ma; near Cuttingsville, Vermont, 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/52150531429.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52150531429_85abcff2d6_m.jpg" alt="" /></a><br />Syenite (Cuttingsville Complex, mid-Cretaceous, 97 Ma; near Cuttingsville, Vermont, USA) 6 / James St. John</span>

サイズ変更など

Spinifex komatiite sill in cumulate komatiite lava flow (Upper Komatiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711-2.717 Ga; Pyke Hill, near the Potter Mine, east of Timmins, Ontario, Canada) 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/47843348101.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/47843348101_cca0ef21af_m.jpg" alt="" /></a><br />Spinifex komatiite sill in cumulate komatiite lava flow (Upper Komatiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711-2.717 Ga; Pyke Hill, near the Potter Mine, east of Timmins, Ontario, Canada) 18 / James St. John</span>

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Acapulcoite (North West Africa 2989 Meteorite) 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/14808094923.html" target="_blank"><img src="http://farm6.static.flickr.com/5568/14808094923_9b9d1431bc_m.jpg" alt="" /></a><br />Acapulcoite (North West Africa 2989 Meteorite) 1 / James St. John</span>

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Sunstone (Tertiary; Spectrum Mine, Oregon, 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/51660724821.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51660724821_0ac04465e7_m.jpg" alt="" /></a><br />Sunstone (Tertiary; Spectrum Mine, Oregon, USA) 12 / James St. John</span>

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Porphyritic diabase (Cape Ann, Massachusetts, 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/51619590042.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51619590042_da3ee6e9ab_m.jpg" alt="" /></a><br />Porphyritic diabase (Cape Ann, Massachusetts, USA) 3 / James St. John</span>

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