Rock Tumbling

Calendar time documentation for rock tumbling different materials from start to finish, including agate at 28 days, obsidian at 18 days, and beryl at 70+ days based on Mohs hardness.

Documentation of the four-stage rock tumbling grit progression from 60/90 coarse through final polish, including particle sizes, economics, and what happens at each stage.

Every lapidary book shows the Mohs scale chart. Here's what actually happens when you test unknown stones with files, knives, and the tools that work in practice.

This is a complete guide to rock tumblers. Learn how to get professional-grade polished stones from this comprehensive analysis.