What makes a rock look glassy?

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Offline iEvolve

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What makes a rock look glassy?
« on: 19/12/2013 21:55:45 »



There's a big rock made of this stuff and I just wanted to know what it was? It's main characteristic is dark green/chrome like glass with a hardness of 7-8+. It's slightly magnetic and has 1-2 other kinds of rocks/minerals mixed in it? I've check a multitude of I.d charts and can't find anything on my own so I figured I would ask the experts ;D
« Last Edit: 23/12/2013 09:19:02 by chris »

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Offline RD

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« Last Edit: 20/12/2013 01:59:06 by RD »

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Offline iEvolve

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Re: Found an interesting rock/mineral?
« Reply #2 on: 20/12/2013 01:53:30 »
Hey thanks!

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Offline RD

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Re: Found an interesting rock/mineral?
« Reply #3 on: 20/12/2013 02:05:44 »
Do I get extra points for spotting what looks like signs of onychophagia ?

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Offline Bass

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Re: Found an interesting rock/mineral?
« Reply #4 on: 20/12/2013 22:44:17 »
looks like slag to me.
Old enough to have a grandson
Slow enough to study rocks
Thirsty enough to find a pub