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OBSIDIAN Rough * Choice of Sizes * Natural Black Igneous Knapping Volcanic Glass For Sale
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OBSIDIAN Rough * Choice of Sizes * Natural Black Igneous Knapping Volcanic Glass:
This listing is for your choice of sizes of black Obsidian similar to the photos pictured from Modoc. County, California. These specimens are quite showy - especially with a fresh broken face (first photo) and would look great displayed on your mantle or bookcase. It is also popular knapping rough for making arrowheads, spear points, etc..
Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. Obsidian is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth. It is commonly found within the margins of rhyolitic lava flows known as obsidian flows, where the chemical composition (high silica content) causes a high viscosity, which, upon rapid cooling, results in a natural glass forming from the lava. The inhibition of atomic diffusion through this highly viscous lava explains the lack of crystal growth. Obsidian is hard, brittle, and amorphous; it therefore fractures with sharp edges. In the past, it was used to manufacture cutting and piercing tools, and it has been used experimentally as surgical scalpel blades.
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8 Lbs NATURAL UNTREATED ROUGH BLUE OBSIDIAN 2 Pieces
OBSIDIAN Rough * Choice of Sizes * Natural Black Igneous Knapping Volcanic Glass
Black Obsidian Stone Rough Raw Chunk, High Grade A Quality - Healing Crystals
Obsidian Apache Tears Rough Stone Crystals Gems For Jewelry Healing Tumbling
MASSIVE Rough Natural Black Obsidian Chunks - Huge Raw Black Obsidian Crystals
Extra Large Black Obsidian Rough Stones, 3" - 6" Raw Black Obsidian Natural
Natural Rough Crystals & Stones: Choose lb or oz HUGE RANGE (Wholesale Bulk)
FIRE OBSIDIAN - AAA+ Quality - VERY RARE Rough From GLASS BUTTE OR. (21 grams)