Dims: 1.12x0.82x0.53" (2.84x2.08x1.35cm)
Wt: 0.15oz (4.2g)
Kudriary Volcano, Iturup Island, Russia
This is a specimen of the extremely rare mineral rheniite, a sulfide of the extremely rare element, Rhenium. The rheniite is easily visible as the extremely lustrous metallic balls on the porous host rock. The are as bright as fresh mercury droplets, and that is what they look like under a loupe. There is a fair amount of it here, as it nearly coats one end of the specimen. It sparkles brightly enough that all of it can readily be seen even without a loupe, so long as a bright light is available.