Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth. Obsidian is commonly found within the margins of rhyolitic lava flows known as Obsidian Flows. 
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Purchase a piece here - http://www.ukge.com/en-gb/Minerals-and-Crystals/Minerals-M-R/Obsidian__p-387-383-3356.aspx
  • ukge_depositsmagObsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth. Obsidian is commonly found within the margins of rhyolitic lava flows known as Obsidian Flows.
    #minerals #naturalworld #minecraft #mineral #ukge
    Purchase a piece here - http://www.ukge.com/en-gb/Minerals-and-Crystals/Minerals-M-R/Obsidian__p-387-383-3356.aspx

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