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Obsidian


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Obsidian
   is coloured   
Black
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.
Obsidian
      
Needs a Diamond Pickaxe to Mine






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