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The best obsidian is formed underground near a volcanic vent because those rocks will have limited impurities. Obsidian flows are so slow that often other obsidian flows will occur on top of each other causing a streaked appearance in the obsidian rock.he result is a rock that cooled so fast, crystals did not get a chance to form. Obsidian is a volcanic glass with a smooth and uniform structure. Interesting Obsidian Rock Facts: Different varieties of obsidian rock get their names from their appearance.
Report Abuse. Obsidian is an igneous rock. Any and all igneous rocks can turn into any and all metamorphic or sedimentary rocks. Obviously what it will 'turn into' down the line is dependent on it's location and the environment at that location, but location and environment are never permanent.The midwest used to be a huge ocean, etc.he rock cycle is really really simple. There are three types of rocks. Any of the three can turn into any of the other two types, but it takes a combination of some or all of the following: time, erosion, compaction, lithification, melting, or partial melting. Marty Â· 6 years ago.