Is Obsidian a basalt?
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Updated: 2019/10/18
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Views: 421 Likes: 64
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It is sometimes classified as a mineraloid. Though obsidian is usually dark in color, similar to mafic rocks such as basalt, obsidian's composition is extremely felsic. Obsidian consists mainly of SiO2 (silicon dioxide), usually 70 or more. Crystalline rocks with obsidian's composition include granite and rhyolite.
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