“Reference: 16NTL63 Group of interpenetrating Quartz crystals, one of them clearly dominant and doubly terminated, slightly transparent, with the typical crystallization on one side and polycrystalline growths on the back partially covered by Siderite crystals, leafy crystals of Muscovite and small traces of Ferberite crystals. Minas da Panasqueira, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal (2000) Specimen size: 13.2 × 7.8 × 3.7 cm = 5.20” × 3.07” × 1.46” Main crystal size: 13.2 × 5.2 cm = 5.20” × 2.05” ”