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Old 01-23-2013, 01:14 AM   #1
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Default Help with rock identification

Even my Google-fu is stumped with this one. I inherited a rock collection from my great grandfather about 20 years ago. I'm thinking of using some of it in a tank.

Does anyone know what this rock is? I have some vinegar to test it with, but nothing stronger. I have enough of this rock to use it as my hardscape with some driftwood, but I'm trying to ID it first!
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