Arsenopyrite with Quartz and Siderite

Minas da Panasqueira, level 2, Aldeia de São Francisco de Assis, Covilhã Municipality, Castelo Branco District  Portugal (1995)

Specimen size: 11.5 × 7.9 × 5.7 cm = 4.53” × 3.11” × 2.24”
Main crystal size: 2.1 × 0.6 cm = 0.83” × 0.24”