Polydymite, Calcite
Madziwa Mine, Shamva District, Mashonaland Central, Zimbabwe
6.2 x 5.7 x 3.8 cm. Polydymite, a rare nickel sulfide species, is a member of both the Linnaeite Group, and the Thiospinel Group. It has been reported from dozens of world localities, but the crystals are often < 1 mm, and sometimes are only observed in minute un-crystallized "threads". This piece, however, features large, robust, splendent, ...
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