Marcasite-Arsenopyrite with Quartz and Siderite

Minas da Panasqueira, level 2, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal (±1982)

Specimen size: 6.6 × 5.7 × 5 cm = 2.60” × 2.24” × 1.97”
Main crystal size: 2.8 × 2.2 cm = 1.10” × 0.87”