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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.
Obsidian is formed in the Igneous phase of the rock cycle. Its formed as a result of rapid cooling of erupted lava, Obsidian also referred to as Volcanic Glass is an Extrusive Igneous Rock and comes to existence when lava at the earth surface cools at a very fast rate that its crystallization stage hardly comes to play, it appears as a massive rock that is very fine and smooth to touch, and glassy in appearance.