Von einer US-amerikanischen Mineralienseite:
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The micro-abrader or "bead blaster" is the ultimate cleaning machine, hands down. It is an air-driven tool that propels a concentrated stream of of tiny abrasive particles at high velocities to quickly erode away unwanted material from mineral specimens, fossils, etc. They are used extensively in the dental industry, and also by museums and mineral suppliers. Different types of abrasive powders are used for different applications (ideally the abrasive media should be harder than the matrix material but softer than the specimen itself). For cleaning minerals, the most widely used media consists of tiny glass spheres. For softer minerals, powdered dolomite, sodium bicarbonate, and crushed walnut shells are also used. « ....
Klingt verrückt. Hat jemand so etwas schon mal ausprobiert?
MM-Bär