,,Tumbling" is a simple technique for the finishing of semi-precious stones, which is within the reach of the amateur-mineralogist. Rock fragments (for instance achate) are ground and polished using abrasive powder and water in a rotating drum. A handiman could easily construct such a tumbler.
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| Grondboor & Hamer | |
| CC BY 3.0 NL ("Naamsvermelding") | |
| Organisation | Nederlandse Geologische Vereniging |
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A. van der Meer. (1967). Getrommelde stenen. Grondboor & Hamer, 21(5), 149–155. |
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