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Rock Tumbler - World Geology Gem

in Rock Tumblers.

NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit - Includes Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, Learning Guide, Great Stem Science Kit

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I got a rock tumbler and after going through the four phases, the rocks are smooth but not shiny. Is there an extra step I missed or am missing? - Quora

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