NE59AM7: Complex crystals of caramel-colored Sphalerite, with very sharp crystal forms, more isolated than usual in pieces from this locality, transparent, with good luster and an intense color, on matrix, with white Dolomite and brown rhombohedral Siderite crystals. The mine has been closed for years and half flooded, making it almost impossible to obtain new specimens.
Troya Mine, Mutiloa, Comarca Goyerri, Guipúzcoa / Gipuzkoa, Basque Country (Euskadi)  Spain (1990)

Specimen size: 4.8 × 2.8 × 3.3 cm = 1.89” × 1.10” × 1.30”

Main crystal size: 1 × 0.6 cm = 0.39” × 0.24”