Cassiterite (twinned)

Minas da Panasqueira, level 2, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal

Specimen size: 3.5 × 2.6 × 2 cm = 1.38” × 1.02” × 0.79”
Main crystal size: 2.6 × 2.3 cm = 1.02” × 0.91”