Cassiterite with Calcite, Quartz and Pyrite

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

Specimen size: 2.6 × 1.9 × 1.4 cm = 1.02” × 0.75” × 0.55”
Main crystal size: 1.4 × 1.3 cm = 0.55” × 0.51”