Need help identifying a rock/mineral

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Offline CLM7205

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Need help identifying a rock/mineral
« on: 23/03/2009 18:35:44 »
Any idea what type of rock/mineral this is?  Thanks for any help!  Chris




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Offline Bass

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Need help identifying a rock/mineral
« Reply #1 on: 23/03/2009 18:45:26 »
First impression is some sort of jasper/jasperoid (cryptocrystalline silica).  Would necessitate a hard tool to make the inscribed symbols though.  Can you scratch it with a knife (try a discrete small area on the back)?
Old enough to have a grandson
Slow enough to study rocks
Thirsty enough to find a pub