Marcasite with Pyrite, Arsenopyrite, Calcite and Dolomite

Minas da Panasqueira, level 2, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro Region, Portugal  Portugal (1998)

Specimen size: 6.4 × 4.8 × 2.7 cm = 2.52” × 1.89” × 1.06”
Main crystal size: 1.3 × 1.1 cm = 0.51” × 0.43”