JFD162AO8: Panasqueira arsenopyrites are said to be the best in the world, and we could spend hours discussing that, but this piece with its Muscovite base and the white carbonates behind it, is a great example of why one could come to that conclusion.
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”