'Obsidian, Lake County, Oregon'

'Obsidian, Lake County, Oregon'

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Caption: Obsidian is volcanic glass. It forms when magma (molten rock) is ejected into the air during volcanic activity and chills (cools) so quickly that mineral crystals do not have a chance to form. Obsidian breaks with the conchoidal fracture characteristic of all glass. It is usually black, but may have bands or inclusions that create various optical effects, including a reflective 'sheen' in silver, gold or even rainbow colors.

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Keywords: arem collection, conchoidal, conchoidal fracture, cooling history, fracture, geologic feature, geological, geology, glass, grain size, grains, igneous, magma, mineralogy, properties, rock, rocks, sheen obsidian, specimen, texture, volcanic activity, volcanic glass, volcanoes

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