wildcat45 wildcat45

23-02-2017
Social Studies

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Why does obsidian contain few or no mineral grains?

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yooitzbryan yooitzbryan

23-02-2017

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

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twentyonepilots7 twentyonepilots7

23-02-2017

because the texture is glassy and because it cools so fast

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