Marcasite with Pyrite, Arsenopyrite, Calcite and Dolomite

Minas da Panasqueira, level 2, Aldeia de São Francisco de Assis, Covilhã Municipality, Castelo Branco District  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”