Obsidian Obsidian is dense volcanic glass, usually rhyolite in composition and typically black in color. Compared with window glass, obsidian is rich in iron and magnesium; tiny (<.005 mm) crystals of iron oxide within - Conchoidal fracture - Document - PDFSEARCH.IO

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$Volcanology / Lithics / Volcanic rocks / Ferromagnetic materials / Gemstones / Obsidian / Rhyolite / Conchoidal fracture / Iron / Petrology / Igneous petrology / Geology$	Obsidian Obsidian is dense volcanic glass, usually rhyolite in composition and typically black in color. Compared with window glass, obsidian is rich in iron and magnesium; tiny (<.005 mm) crystals of iron oxide within Add to Reading List Document Date: 2011-07-01 20:06:49 Open Document File Size: 91,00 KB Share Result on Facebook IndustryTerm chemical / steel / / SocialTag Volcanology Lithics Volcanic rocks Ferromagnetic materials Gemstones Obsidian Rhyolite Conchoidal fracture Iron Petrology

Obsidian Obsidian is dense volcanic glass, usually rhyolite in composition and typically black in color. Compared with window glass, obsidian is rich in iron and magnesium; tiny (<.005 mm) crystals of iron oxide within Add to Reading List