Wikimedi'Òc

Aphyritc & partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 5 (46809775731).jpg - Ser Amantio di Nicolao

Aphyritc & partially devitrified rhyolitic obsidian (Roaring Mountain Member, Plateau Rhyolite, Upper Pleistocene, ~59 ka; Obsidian Cliff, Yellowstone, Wyoming, USA) 6 (39844345913).jpg - Ser Amantio di Nicolao

Nelsonite (Proterozoic; Port Leyden, western Adirondacks, New York Sate, USA) 1.jpg - Ser Amantio di Nicolao

Anorthosite & nelsonite gravel pile (Sybille Canyon, Laramie Range, Wyoming, USA).jpg - Ser Amantio di Nicolao

Kimberlite (Indian Guide Kimberlite Field, Devonian; Iron Mountain Kimberlite District, Wyoming, USA) 8.jpg - Ser Amantio di Nicolao

Kimberlite (Indian Guide Kimberlite Field, Devonian; Iron Mountain Kimberlite District, Wyoming, USA) 7.jpg - Ser Amantio di Nicolao

Kimberlite (Indian Guide Kimberlite Field, Devonian; Iron Mountain Kimberlite District, Wyoming, USA) 5.jpg - Ser Amantio di Nicolao

Kimberlite (Indian Guide Kimberlite Field, Devonian; Iron Mountain Kimberlite District, Wyoming, USA) 6.jpg - Ser Amantio di Nicolao

Kimberlite (Indian Guide Kimberlite Field, Devonian; Iron Mountain Kimberlite District, Wyoming, USA) 4.jpg - Ser Amantio di Nicolao

Kimberlite (Indian Guide Kimberlite Field, Devonian; Iron Mountain Kimberlite District, Wyoming, USA) 3.jpg - Ser Amantio di Nicolao

Kimberlite (Indian Guide Kimberlite Field, Devonian; Iron Mountain Kimberlite District, Wyoming, USA) 2.jpg - Ser Amantio di Nicolao