What type of rock is asbestos and volcanic glass (obsidian)?

Both asbestos and obsidian are metamorphic rock types. The origin of these minerals is associated with metamorphism, that is, changes, of several types. Sedimentary rocks, including asbestos, and igneous rocks, including obsidian (volcanic glass), are exposed to pressure, high temperature, various gas and water solutions, which contributes to their metamorphism (changes).



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