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Play Fact Master on Gemstones - Colours  (it's free)    

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Obsidian is a naturally occurring glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools without crystal growth.The presence of hematite produces red and brown varieties, and the inclusion of tiny gas bubbles may create a golden sheen. Obsidian in attractive and variegated colours is used as a semiprecious stone. It possesses the property of presenting a different appearance according to the manner in which it is cut.
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