Dims: 0.81x0.63x0.41" (2.05x1.60x1.03cm)
Wt: 0.21oz (5.9g)
This is a specimen of the rare mineral gadolinite-Y. It is black, opaque, and has a luster which varies from pitchy on the natural surfaces to vitreous on the fracture surfaces, which is most of the specimen. There are suggestions of crystal form, with several areas displaying the correct crystal angles for a natural surface. There are tiny amounts of other minerals present, including a fair amount of a K-feldspar.