16NF13: A plate formed by an aggregate of Muscovite crystals, interspersed with some lustrous Arsenopyrite crystals with well defined faces and edges, as well as water-clear Quartz crystals, one of them clearly dominant and with very marked growth striations. This combo is further adorned by a group of light brown lenticular Siderite crystals with a darker outline, some of them scattered and more isolated while others have grown on the Quartz crystals. Finally, a small group of Pyrite crystals completes the specimen. As so often happens with Panasqueira specimens, we can observe part of the paragenesis of the mine in a single piece.
Minas da Panasqueira, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal

Specimen size: 11.0 × 10.0 × 3.0 cm = 4.33” × 3.94” × 1.18”

Main crystal size: 1.0 × 0.9 cm = 0.39” × 0.35”