Location: Mina da Panasqueira, Covilhã, Castelo Branco, Portugal.
Cluster of prismatic crystals with about 4.0 x 3.2 x 2.3cm and 51 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.