Where to Buy Tumbling Rocks: 5 Popular Sites, Compared
Relatively hard minerals – Rocks that are too soft will quickly disintegrate in the tumbling barrel. Most batches, especially those for beginners, will consist of rocks and minerals with hardnesses between 6 and 8 on Mohs hardness scale. ... few very large or small rocks: Kingsley North: 8: Good general size, few very large or small rocks ...
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