Скачать или смотреть Ask-a-Geologist #8: What is the rock obsidian used for?

John asked us about the igneous rock obsidian. Obsidian is a type of rock glass formed when expels from a volcano and cools very quickly. Today, manufacturers use obsidian to make rock wool, knives, and jewelry. Did you know that there are several types of obsidian? Here we explain two of the most common and beautiful varieties.

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