A compact specimen formed by a matrix of very bright arsenopyrite crystals in parallel growth on which several cassiterite crystals have grown. These show the typical cyclic twin of cassiterite. Bright and defined, they are accompanied by crystals of siderite and muscovite.

ORIGIN: PANASQUEIRA MINES, VILLAGE OF SÃO FRANCISCO DE ASSIS, COVILHÃ, CASTELO BRANCO, COVA DA BEIRA, PORTUGAL

DIMENSIONS: 5.2x4.2x4.5