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01-10-2011, 04:16 PM
Thread: Two For The Rockhounds
by thebigspendur- Replies
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Well, volcanic Tuffa is just very fine volcanic...
Well, volcanic Tuffa is just very fine volcanic dust that collects and gets compacted into stone. You'd have to know the exact makeup of the stuff to figure the grit other than to just use it.
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