From: Panasqueira Mine, Covilhã, Castelo Branco, Portugal.
Sample with 5,0 x 4,0 x 2,5cm  and 37 gramas. 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.