Arsenopyrite-Marcasite with Siderite and Muscovite

Minas da Panasqueira, level 0, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal

Specimen size: 7.3 × 6.9 × 3.8 cm = 2.87” × 2.72” × 1.50”
Main crystal size: 2 × 1.2 cm = 0.79” × 0.47”