Why does obsidian contain few or no mineral grains?

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23-02-2017
Social Studies

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Why does obsidian contain few or no mineral grains?

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yooitzbryan yooitzbryan · Answer 1 · 2017-02-23T16:58:54+01:00

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 · Answer 2 · 2017-02-23T17:03:57+01:00

twentyonepilots7 twentyonepilots7

23-02-2017

because the texture is glassy and because it cools so fast

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