Miniature, 3.9 x 3.7 x 3.3 cm
Kudriavy (Kudryavyi) volcano, Iturup Island, Kuril Islands, Sakhalinskaya Oblast', Far-Eastern Region, Russia
Rheniite is the only known mineral with Rhenium as its primary metallic constituent and as such is a fascinating species. It occurs at a volcanic vent in this remote area of Russia, and scientists have to climb down into hot crevasses to find the stuff. This is a really rich specimen with lots of silvery bright microcrystalline rheniite filling the 3-dimensional vug.