Location: Mina da Panasqueira, Covilhã, Castelo Branco, Portugal.
Translucent gray green sub-euhedral hexagonal prism with 2.0 x 2.3 x 2.1cm. Formed in mineralized veins of quartz, sulfides, wolframte, cassiterite, micas, fluorite, carbonates, among others, associated with the generation of a greisen dome by granitic intrusion in Paleozoic shales and graywackes.