Obsidian is an extrusive igneous rock formed as a result of rapid cooling of molten lava.
Obsidian-Mineraloid
5-6
Obsidian may be found in Japan, Iceland, Italy and U.S, Mexico
Obsidian has a snowflake pattern, when there is an inclusion of small, white clustered crystals of cristobalite.
Obsidian containing gas bubbles may produce a golden sheen
Gas bubble inclusion can also create iridescence effect in obsidian making the variety "Rainbow obsidian"
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