Location: Panasqueira Mine, Covilhã, Castelo Branco, Portugal.
Sub-euhedral striated Arsenopyrite crystal with 2.5cm associated with anhedral to euhedral dark brown Cassiterite and transparent Quartz. Sample with 3.0 x 2.2 x 2.5cm. 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.