Igneous obsidian
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Igneous obsidian

Obsidian rocks are igneous rocks that form when lava cools quickly above ground. Obsidian is actually glass and not a mixture of minerals. The edges of this rock are very sharp. Example are Feldspar, quartz and mica.

[Image: obsidian.jpg]
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Igneous obsidian - by Pulkitm - 08-19-2014, 10:46 AM

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