From: Mina da Panasqueira, Covilhã, Castelo Branco, Portugal.
  
Green grey translucent hexagonal prism with 2,5 x 2,0 x 1,5cm. 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.