Rare in such sharp and isolated crystals, this is a gorgeous miniature of erythrite, a rare cobalt species. It shows off unusually well isolated razor sharp crystals to 2.1 cm, and all accented nicely atop accenting balls of another generation of this rare cobalt species. This is a superb miniature example from the Paul Stahl collection, and likely from Francois Lietard in the 1990s (knowing Paul, and seeing this unusual style, that is my guess when he bought it).
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