MF98AM5: Groups of crystals of Sphalerite with the dominant forms of the tetrahedron, transparent, with good luster and a very intense and vivid green color (variety cleiophane) on a matrix covered by white rhombohedral Dolomite crystals. The specimen is very different from what is usually seen at this locality both in color and in general appearance.
Áliva Mine (Las Mánforas Mine), Áliva mining area, Picos de Europa massif, Camaleño, Comarca Liébana, Cantabria  Spain

Specimen size: 13.2 × 8.8 × 6.9 cm = 5.20” × 3.46” × 2.72”