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The Thames & Kosmos Rock Tumbler is a geology kit that turns rough stones into polished rocks. It ships with natural samples such as tiger's eye, aventurine and rose quartz, four polishing grits, jewelry fasteners and a manual plus poster on the rock cycle. Its leak-proof, noise-reducing barrel and built-in timer that runs up to seven days set it apart from basic tumblers, and the motor is built to keep going with glass, wood and found rocks after the starter batch. It suits kids and beginners who want a guided first kit more than a high-capacity hobby machine.
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Owners of Thames & Kosmos science kits generally rate the line well for clear instructions and real materials. The tumbler's timer and quieter barrel are the features most often singled out, while its small barrel size is the usual complaint.
The Thames & Kosmos Rock Tumbler turns rough stones into polished rocks. It lets young geologists and gem collectors explore erosion, weathering and the geological rock cycle.
The kit includes natural rock samples such as tiger's eye, aventurine and rose quartz, along with four polishing grits. Jewelry settings are included so polished stones can be made into accessories. After the included rocks are done, the tumbler can also be used with rocks, glass, wood and other materials the user collects.
The motor is built to be durable and long-lasting. The barrel is leak-proof and reduces noise. A built-in timer has several settings and can run for up to seven days. The manual and poster give usage instructions and science information about rock types and how they form.
