JFD153AO7: Panasqueira pyrites are unmistakable. It is curious that such a common mineral can be assigned to one locality in such a recognizable way. Flattened cubes, rich in faces, with Calcite-Dolomite in many cases and that brass-like color, from ancient ore.
It is nice what they call the pyrites in Panasqueira when they have this type of tones or they are oxidized: 'ferruginadas'
Minas da Panasqueira, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro Region  Portugal (1989)

Specimen size: 9.2 × 8.3 × 3.1 cm = 3.62” × 3.27” × 1.22”

Main crystal size: 0.6 × 0.4 cm = 0.24” × 0.16”