Dims: 1.68x1.27x0.68" (4.27x3.24x1.74cm)
Wt: 0.58oz (16.5g)
Kudriary Volcano, Iturup Island, Russia
Tiny balls of the rare mineral rheniite, a sulfide of the extremely rare element, Rhenium, are scattered throughout the host rhyolite. The rheniite appears to be lustrous metallic balls, too small to examine even with my loupe. It sparkles brightly, although it is only on one surface, but is especially concentrated along the side of a crevice.