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A rock tumbler is a machine used to polish hard rocks and gemstones such as quartz, agate and jasper. Rock tumblers generally consist of a rotating barrel Friendly Review of the National Geographic Hobby Rock Tumbler Kit (amzn.to/2pNGw3P). Featured is an discoverwithdrcool.com. 1. Rock tumbler base. 2. Tumbling barrel. 3. Grit (inside barrel). 4. Rough gemstones (inside