WPF66CD2: Very well-developed Quartz crystal with parallel growth on the terminal faces and several very sharp, black, and shiny crystals of Cassiterite. The Quartz is partially coated with small lenticular crystals of Siderite, in turn covered with very shiny microcrystals of Pyrite.
Like all specimens in Raúl Sanabria's collection, it was chosen with great care, always aiming to have something special that sets it apart.
Minas da Panasqueira, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal

Specimen size: 17.5 × 9.8 × 9.4 cm = 6.89” × 3.86” × 3.70”

Main crystal size: 1.4 × 1 cm = 0.55” × 0.39”