Quartz with Arsenopyrite, Marcasite, Siderite, Calcite and Muscovite

Minas da Panasqueira, level 2, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro Region  Portugal (2004)

Specimen size: 10.1 × 8.8 × 3.9 cm = 3.98” × 3.46” × 1.54”
Main crystal size: 9.1 × 6.3 cm = 3.58” × 2.48”