Marcasite with Arsenopyrite and Calcite-Dolomite

Minas da Panasqueira, level 2, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal (1993)

Specimen size: 10.4 × 7.1 × 5.1 cm = 4.09” × 2.80” × 2.01”
Main crystal size: 1.9 × 1.8 cm = 0.75” × 0.71”