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Why does obsidian contain few or no mineral grains?
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Why does obsidian contain few or no mineral grains?

User Fearphage
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because the texture is glassy and because it cools so fast 
User Donald Burr
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The material that would normally form mineral crystals does not have time to form a crystalline structure because of very rapid cooling after volcanically erupting into the air or onto the surface. Obsidian is a volcanic glass
User Tim Keating
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