Enjoy this Google Map of the Glass Buttes Obsidian site.
Obsidian, a volcanic glass, is perhaps one of the easiest rock materials to identify. Brittle and usually black in color, it exhibits an extremely shiny surface when broken. The most desirable obsidian types include gold sheen, silver sheen, fire sheen, rainbow, midnight lace, double flow, and mahogany. Chips or broken edges are as sharp as broken glass, and should be handled with care. The area around Glass Buttes has been designated for recreational obsidian collecting; mining claims may not be filed for obsidian or chalcedony (agate).
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