- Miniature, 3.6 x 3.5 x 1.0 cm
- Akchatau Mine, Qaraghandy Oblysy (Karaganda Oblast), Kazakhstan
- Ex. Ernest Schlichter
This rare earth crystal is characterized by brilliant metallic luster along with a silver-black color. Although slightly rough around the perifera, it is nevertheless complete and very large for the species. Slightly radioactive. A rare mineral indeed!