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Obsidian Rocks For Sale!
Obsidian rocks is a type of igneous rock. Obsidian is formed outside of a volcano, when lava quickly starts to cool. Obsidian rocks are very beautiful and some jewelry makes like using obsidian because of its beautiful color. Also, it is used in tools for cutting.Extrusive or Intrusive? Obsidian rocks are extrusive because they are formed above ground.Fine or coarse grained or both? Obsidian rocks are Fine. Composition? Granitic.Bubbles represent? They would be gas bubbles left from the lava.
Source-http://geology.com/rocks/obsidian.shtml
