Is Obsidian an igneous, sedimentary or metamorphic rock?
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Obsidian is a hard, dark, glasslike volcanic rock formed by the rapid solidification of lava formed without crystallization.
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Obsidian rocks are igneous rocks that form when lava cools quickly above ground. Obsidian is actually glass and not a mixture of minerals.Metamorphic - Sedimentary andigneous rocks which were subjected to more intense pessure or heat and as a result underwent a complete change.
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