mesoproterozoic

"Missouri Red Granite" (Graniteville Granite, Mesoproterozoic, 1.317 Ga; St. Francois Mountains, Missouri, USA)
by James St. John

Impact breccia (Cretaceous-Tertiary boundary, 65 Ma; Boltysh Impact Structure, Ukraine) 2
by James St. John

Native copper (Mesoproterozoic, 1.05-1.06 Ga; Keweenaw Peninsula area, Upper Peninsula of Michigan, USA) 7
by James St. John

Copper crystal (Mesoproterozoic, 1.05-1.06 Ga; Calumet and Hecla Mine, Calumet, Upper Peninsula of Michigan, USA)
by James St. John

Marinace Green Granite (polymict metaconglomerate) (Ouricuri do Ouro Formation, Mesoproterozoic, ~1.6-1.7 Ga; Bahia, Brazil) 8
by James St. John

Nara Brown Granite (charnockite/farsundite/quartz mangerite) (Riviere-a-Pierre Plutonic Suite, Mesoproterozoic, ~1.1 Ga; north of Riviere-a-Pierre, Quebec, Canada)
by James St. John

Copper (Mesoproterozoic, 1.05-1.06 Ga; copper mine in the Upper Peninsula of Michigan, USA) 2
by James St. John

Silver-copper mass (Mesoproterozoic, 1.05-1.06 Ga; Central Mine, Ontonagon County, Upper Peninsula of Michigan, USA) 2
by James St. John

Native copper (Mesoproterozoic, 1.05-1.06 Ga; Keweenaw Peninsula area, Upper Peninsula of Michigan, USA) 12
by James St. John

Mudcracks in argillite (Grinnell Formation, Mesoproterozoic, ~1.45 Ga; Glacier National Park, Montana, USA) 5
by James St. John

Native copper from intraclast conglomerate matrix (Mesoproterozoic, 1.05-1.06 Ga; Conglomerate Lode, Centennial Mine, Houghton County, Michigan, USA) 2
by James St. John

Silver (Mesoproterozoic, 1.05-1.06 Ga; Michigan Mine, Ontonagon County, Upper Peninsula of Michigan, USA)
by James St. John

Marinace Green Granite (polymict metaconglomerate) (Ouricuri do Ouro Formation, Mesoproterozoic, ~1.6-1.7 Ga; Bahia, Brazil) 9
by James St. John

Marinace Green Granite (polymict metaconglomerate) (Ouricuri do Ouro Formation, Mesoproterozoic, ~1.6-1.7 Ga; Bahia, Brazil) 11
by James St. John

Banded massive sulfide (silver-lead-zinc ore) (Sullivan Deposit, Aldridge Formation, Mesoproterozoic, 1470 Ma; Sullivan Mine, British Columbia, Canada) 5
by James St. John

Nelsonite (Laramie Anorthosite Complex, Mesoproterozoic, 1.43 Ga; Sybille Pit, Laramie Range, Wyoming, USA) 12
by James St. John

Sulfidic gabbro (nickel ore) (Voisey's Bay Ni-Cu-Co Magmatic Sulfide Deposit, Mesoproterozoic, 1.333 Ga; Voisey's Bay Mine, Labrador, Canada) 1
by James St. John

Moonstone (iridescent peristerite-oligoclase feldspar) (Chupa Pegmatite Field, Mesoproterozoic, 1.75 to 2.10 Ga; at or near Chupa Bay, Karelia, Russia) 1
by James St. John

Blue calcitic marble (proximal host rock to the Valentine wollastonite skarn deposit, late Mesoproterozoic, 1130-1160 Ma; Valentine Mine (Gouverneur Talc Company No. 4 Quarry), Lewis County, New York State, USA)
by James St. John

Anorthosite ("Blue Eyes Granite") (Nain Anorthosite, Mesoproterozoic, 1.29-1.35 Ga; Ten Mile Bay Quarry, Labrador, Canada) 9
by James St. John

Fault pseudotachylite (Homestake Shear Zone, Mesoproterozoic, 1375-1386 Ma) in gneiss (Paleoproterozoic, 1630-1710 Ma; Homestake Creek Valley, Sawatch Range, Colorado, USA) 22
by James St. John

Black Angola Granite (gabbro) (Kunene Complex, Mesoproterozoic, 1347-1371 Ma; Lubango, Angola) 2
by James St. John

Amygdaloidal basalt (Portage Lake Volcanic Series, upper Mesoproterozoic, 1.093 to 1.097 Ga; Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 25
by James St. John

Copper skull (Mesoproterozoic, 1.05-1.06 Ga; Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 3
by James St. John

Lamproitic lapilli-ash metatuff (Argyle Lamproite, Mesoproterozoic, 1.178 Ga; Argyle Mine, nw Western Australia)
by James St. John

Black Cambrian Granite (norite) (Lac-St.-Jean Anorthosite Suite, 1.14-1.16 Ga, Mesoproterozoic; St. Nazaire, Quebec, Canada)
by James St. John

Nelsonite-anorthosite (Poe Mountain Anorthosite, Mesoproterozoic, 1.431-1.436 Ga; Sybille Canyon, Laramie Range, Wyoming, USA) 2
by James St. John

Franklinite-willemite-calcite rock (Franklin Marble, Mesoproterozoic, 1.03-1.08 Ga; Franklin, New Jersey, USA) 2
by James St. John

Anorthosite ("Blue Eyes Granite") (Nain Anorthosite, Mesoproterozoic, 1.29-1.35 Ga; Ten Mile Bay Quarry, Labrador, Canada) 7
by James St. John

Rose muscovite (Harding Pegmatite, Mesoproterozoic, 1.33 Ga; Picuris Mountains, New Mexico, USA) 2
by James St. John

Copper and silver (Mesoproterozoic, 1.05-1.06 Ga; Calumet and Hecla Mine, Calumet, Upper Peninsula of Michigan, USA) 2
by James St. John

Granite (Pikes Peak Batholith (pgpf dike facies), Mesoproterozoic, 1.08 Ga; next to summit house atop Pikes Peak, central Colorado, USA) 2
by James St. John

Silver Plume Granite (Mesoproterozoic, 1.42 Ga; Rainbow Curve roadcut, Rocky Mountains National Park, Colorado, USA)
by James St. John

Marinace Green Granite (polymict metaconglomerate) (Ouricuri do Ouro Formation, Mesoproterozoic, ~1.6-1.7 Ga; Bahia, Brazil) 10
by James St. John

Nelsonite (Laramie Anorthosite Complex, Mesoproterozoic, 1.43 Ga; Sybille Pit, Laramie Range, Wyoming, USA) 2
by James St. John

Allouez Conglomerate (Mesoproterozoic, ~1.094 Ga; Delaware Copper Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 1
by James St. John

Amygdaloidal basalt (Portage Lake Volcanic Series, upper Mesoproterozoic, 1.093 to 1.097 Ga; Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 1
by James St. John

Copper skull (Mesoproterozoic, 1.05-1.06 Ga; Calumet and Hecla Mine, Calumet, Michigan, USA) 2
by James St. John

Silver (Kearsarge Lode, Mesoproterozoic, 1.05-1.06 Ga; Houghton County, Upper Peninsula of Michigan, USA)
by James St. John

Nelsonite (Laramie Anorthosite Complex, Mesoproterozoic, 1.43 Ga; Sybille Pit, Laramie Range, Wyoming, USA) 9
by James St. John

Silver (Mesoproterozoic, 1.05-1.06 Ga; Mohawk Mine, Keweenaw County, Upper Peninsula of Michigan, USA) 2
by James St. John

Silver (Mesoproterozoic, 1.05-1.06 Ga; South Kearsarge Mine, Houghton County, Upper Peninsula of Michigan, USA)
by James St. John

Banded massive sulfide (silver-lead-zinc ore) (Sullivan Deposit, Aldridge Formation, Mesoproterozoic, 1470 Ma; Sullivan Mine, British Columbia, Canada) 2
by James St. John

Franklinite-willemite-calcite rock fluorescing (Franklin Marble, Mesoproterozoic, 1.03-1.08 Ga; zinc mine in northern New Jersey, USA) 4
by James St. John

Native copper vein (Mesoproterozoic, 1.05-1.06 Ga; Great Sand Bay, Keweenaw County, Upper Peninsula of Michigan, USA) 5
by James St. John

Copper skull (Mesoproterozoic, 1.05-1.06 Ga; Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 1
by James St. John

Native silver in hydrothermal vein rock (Proterozoic; Silver Islet Mine, Lake Superior, Ontario, Canada) 6
by James St. John

Native copper (Mesoproterozoic, 1.05-1.06 Ga; Keweenaw Peninsula area, Upper Peninsula of Michigan, USA) 5
by James St. John

Nelsonite (Laramie Anorthosite Complex, Mesoproterozoic, 1.43 Ga; Sybille Pit, Laramie Range, Wyoming, USA) 7
by James St. John

Native copper in calcite crystal (late Mesoproterozoic mineralization age, 1.05-1.06 Ga; Quincy Mine, Hancock, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 5
by James St. John

Native copper vein (Mesoproterozoic, 1.05-1.06 Ga; Great Sand Bay, Keweenaw County, Upper Peninsula of Michigan, USA) 4
by James St. John

Copper skull (Mesoproterozoic, 1.05-1.06 Ga; Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 4
by James St. John

Amygdaloidal basalt (Portage Lake Volcanic Series, upper Mesoproterozoic, ~1.095-1.096 Ga; old quarry north of South Range, Upper Peninsula of Michigan, USA)
by James St. John

Copper skull (Mesoproterozoic, 1.05-1.06 Ga; Calumet and Hecla Mine, Calumet, Michigan, USA) 1
by James St. John

Diabase dike (ophitic olivine tholeiite) (right) intruding gabbroic anorthosite to anorthositic gabbro (left) (anorthosite series, Duluth Complex, Mesoproterozoic, 1099 Ma; Merritt Creek West Skyline Parkway roadcut, Duluth, Minnesota, USA) 2
by James St. John

Copper with silver crystals (Mesoproterozoic, 1.05-1.06 Ga; Wolverine Mine, Upper Peninsula of Michigan, USA)
by James St. John

Copper skulls (Mesoproterozoic, 1.05-1.06 Ga; Calumet and Hecla Mine, Calumet, Michigan, USA)
by James St. John

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

Copper skull (Mesoproterozoic, 1.05-1.06 Ga; Calumet and Hecla Mine, Calumet, Michigan, USA) 4
by James St. John

Calcite with two-beam interference colors & native copper (late Mesoproterozoic mineralization age, 1.05-1.06 Ga; Upper Peninsula of Michigan, USA) 4
by James St. John