Wikimedi'Òc

Thomsonite 2 in Basalt Hydrous calcium sodium aluminum silicate Grand Marais Cook Minnesota 1885.jpg - Dyet

Thomsonite in Basalt Hydrous calcium sodium aluminum silicate Grand Marais Cook Minnesota 1884.jpg - Dyet

Metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; large loose block at Ely visitor center, Ely, Minnesota, USA) 11 (20830752274).jpg - Ser Amantio di Nicolao

Metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; large loose block at Ely visitor center, Ely, Minnesota, USA) 1 (21266644269).jpg - Ser Amantio di Nicolao

Metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; Rt. 169 roadcut just west of Ely, Minnesota, USA) 9 (21536183561).jpg - Ser Amantio di Nicolao

Quartz tholeiite basalt lava flow (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 3 (22487523791).jpg - Ser Amantio di Nicolao

Autobrecciated amygdaloidal quartz tholeiite basalt aa lava flow top (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 11 (21856351943).jpg - Ser Amantio di Nicolao

Autobrecciated amygdaloidal quartz tholeiite basalt aa lava flow top (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 10 (22290736859).jpg - Ser Amantio di Nicolao

Autobrecciated amygdaloidal quartz tholeiite basalt aa lava flow top (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 3 (22451631766).jpg - Ser Amantio di Nicolao

Autobrecciated amygdaloidal quartz tholeiite basalt aa lava flow top (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 4 (21854899714).jpg - Ser Amantio di Nicolao

Olivine tholeiite basalt lava flow at Gooseberry Falls - Upper Falls (Gooseberry River Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Gooseberry Falls State Park, Minnesota, USA) (22322482538).jpg - Ser Amantio di Nicolao

Natural arch in basalt (Gooseberry River Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Gooseberry Falls State Park, Minnesota, USA) 2 (21887954414).jpg - Ser Amantio di Nicolao

Natural arch in basalt (Gooseberry River Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Gooseberry Falls State Park, Minnesota, USA) 1 (22322995728).jpg - Ser Amantio di Nicolao

Baptism River Basalt (North Shore Volcanic Group, Mesoproterozoic, ~1097 Ma; Split Rock Lighthouse, Minnesota, USA) 3 (23063082361).jpg - Ser Amantio di Nicolao

Baptism River Basalt (North Shore Volcanic Group, Mesoproterozoic, ~1097 Ma; Split Rock Lighthouse, Minnesota, USA) 1 (22633535998).jpg - Ser Amantio di Nicolao

Basalt (Gooseberry River Basalts, Mesoproterozoic, 1097-1098 Ma; Rt. 61 roadcut just east of Upper Falls, Gooseberry Falls State Park, North Shore of Lake Superior, Minnesota, USA) 3 (23208558712).jpg - Ser Amantio di Nicolao

Tholeiitic basalts (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 11 (23733495115).jpg - Ser Amantio di Nicolao

Tholeiitic basalts (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 3 (23651025291).jpg - Ser Amantio di Nicolao

Plumose marking on joint surface in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 2 (23733446026).jpg - Ser Amantio di Nicolao

Plumose marking on joint surface in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 1 (23391640349).jpg - Ser Amantio di Nicolao

Amygdaloidal basalt (North Shore Volcanic Series, upper Mesoproterozoic, ~1.1 Ga; Grand Marais, Cook County, Minnesota, USA) (39619143950).jpg - Ser Amantio di Nicolao

Intergranular calcite in autobrecciated amygdaloidal tholeiite basalt aa lava flow top (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 1.jpg - Ser Amantio di Nicolao

Intergranular calcite in autobrecciated amygdaloidal tholeiite basalt aa lava flow top (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 4.jpg - Ser Amantio di Nicolao

Intergranular calcite in autobrecciated amygdaloidal tholeiite basalt aa lava flow top (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 7.jpg - Ser Amantio di Nicolao

Large quartz-laumontite-calcite amygdule in quartz tholeiite basalt lava flow (Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA).jpg - Ser Amantio di Nicolao

Large quartz-laumontite amygdule in quartz tholeiite basalt lava flow (Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 3.jpg - Ser Amantio di Nicolao

Large quartz-laumontite amygdule in quartz tholeiite basalt lava flow (Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 5.jpg - Ser Amantio di Nicolao

Large quartz-laumontite amygdule in quartz tholeiite basalt lava flow (Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 7.jpg - Ser Amantio di Nicolao

Large quartz-laumontite amygdule in quartz tholeiite basalt lava flow (Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 2.jpg - Ser Amantio di Nicolao

Large quartz-laumontite amygdule in quartz tholeiite basalt lava flow (Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 11.jpg - Ser Amantio di Nicolao

Amygdaloidal basalt (Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 1.jpg - Ser Amantio di Nicolao

Amygdaloidal basalt (Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 2.jpg - Ser Amantio di Nicolao