Easiest Most Beautiful Rainbow Glitter Geode Tumbler EVER!!! Tumbler Tutorial In this video I show you how to make an amazingly beautiful rainbow geode tumbler with all the tricks with glitter, ...

If you’re reading Hackaday, there’s a good chance you had a rock tumbler in your younger days. Hell, we’d put odds on a few of you having one rumbling away in the background as you read this. They’re ...

While the words “instant gratification” and “rock tumbling” may not fit in the same sentence, the hobby of rock collecting and polishing is still very satisfying. What begins as raw, unrefined rocks ...