Sphalerite crystals with sharp faces and edges, clearly marked growth striations and with a superficial patina of Chalcopyrite, associated with well-formed Arsenopyrite crystals and lenticular Siderite.
The Panasqueira deposit is a Hydrothermal tin-tungsten vein deposit of greisen type, hosted in Hercynian granites and Paleozoic metasediments. The mineralization occurs in a well-structured system of subhorizontal veins, renowned for its abundance and quality of Fluorapatite, Ferberite, Cassiterite, and Fluorite, as well as remarkable secondary minerals.
Minas da Panasqueira, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro Region Portugal (1987-2013)
Specimen size: 3.7 × 3.2 × 2.8 cm = 1.46” × 1.26” × 1.10”
Main crystal size: 3 × 2.7 cm = 1.18” × 1.06”
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