What is the difference between obsidian and basalt

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Though obsidian is usually dark in color, similar to mafic rocks such as basalt, obsidian's composition is extremely felsic. ... Because obsidian is metastable at the Earth's surface (over time the glass becomes fine-grained mineral crystals), no obsidian has been found that is older than Cretaceous age.

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Updated: 2019/10/18

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