Location: Panasqueira Mine, Covilhã, Castelo Branco, Portugal.
Subeuhedral crystal with 3.3 x 3.0 x 2.2cm, with an irregular striated face and 53 grams. Formed in mineralized veins of quartz, sulfides, wolframite, cassiterite, micas, fluorite, carbonates, among others, associated with the generation of a greisen dome by granitic intrusion in Paleozoic schists and graywackes.