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Author Topic: Obsidian  (Read 1372 times)
ah2bqat
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« on: December 23, 2008, 12:49:09 AM »
I've never met anything other than shiny black obsidian.  What makes this stone look like this?

* obsidian.jpg (35.45 KB, 500x500 - viewed 78 times.)
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oldmancoyote
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« Reply #1 on: December 23, 2008, 11:22:10 AM »
Obsidian is basically natural glass - all you need is impurities that colour the glass in different way, not dissimilar to man-made glass; for example red could be copper oxide and black manganese oxide.
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ah2bqat
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« Reply #2 on: December 23, 2008, 02:10:17 PM »
Thanks, OMC.  That's good to know. Grin
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