The Fersman Mineralogical Museum is one of the world's largest mineral museums, with a collection of crystals, geodes, ores, meteorites, gemstones, and stone art. The holdings are serious rather than flashy, but anyone interested in geology or decorative stone will find plenty to linger over.
The gem and stone art displays are the highlight, including Russian stone carving and works linked to the Faberge tradition. It is a specialist museum, but a rewarding one if you want a Moscow stop beyond the usual art and Kremlin circuit.