Rheniite
Kudriavy volcano, Iturup Island, Kurilsky District, Kuril Islands, Sakhalin Oblast, Russia
8.2 x 6.4 x 6.4 cm. Rheniite is the only known mineral with rhenium as its primary metallic constituent and as such is a fascinating species. Very rare, worldwide, it occurs at a volcanic vent in this remote area of Far East Russia (Type Locality), and scientists have to climb down into hot crevasses to find the stuff. Rich fields, to 4.3 cm, with ...
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