National Geographic Hobby Rock Tumbler Kit - Geology Science Kit, Ages 13+ (9-12 with Adult Help)

A complete rock-tumbling lab for an extended earth science project. Students turn rough rocks into polished gemstones over several weeks, learning how erosion and abrasion shape stones in nature while practicing patience and careful record-keeping.

• Learning goals: geology and mineral identification, erosion and abrasion, the Mohs hardness scale, and a multi-stage scientific process.
• Skills practiced: following a multi-week procedure, timing each grit stage, observing and photographing changes, and comparing results.
• What's included: rock tumbler with leak-proof rubber barrel and one-touch timer with automatic shutoff, nine types of real rough gemstones, four stages of polishing grit, sifter, jewelry fastenings, and a detailed full-color learning guide.
• Plugs into a standard outlet. A full tumbling cycle takes several weeks.
• Recommended for ages 13+, or ages 9–12 with adult help (manufacturer age 8+).

A practical hands-on option for Arkansas EFA families planning homeschool lessons. EFA funding eligibility is subject to program rules and approval; approval is not guaranteed.

Adult supervision recommended. Do not pour used grit down drains.