What is the difference between obsidian and basalt?
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Updated: 2019/10/18
Views: 729 
Likes: 148
Views: 729 Likes: 148
Reference Answer
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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