Arsenopyrite (doubly terminated) with Muscovite and Calcite-Dolomite

Minas da Panasqueira, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal (1985)

Specimen size: 4.8 × 4 × 3.4 cm = 1.89” × 1.57” × 1.34”
Main crystal size: 4 × 3.7 cm = 1.57” × 1.46”