Jan 11, 2013 - What types of rock can be used to make polished stones in a rock tumbler? And, just as important - what types of rock do not perform well in a rock tumbler.
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This is my small collection, and some of them I recently tumbled
Tumbling Lake Superior Agates
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National Geographic Rock Tumbler and Jewelry Making Kit – Hearthsong
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Five gallon bucket rock tumbler