EPR87AQ1: Sphalerite crystals with different growth zones, somewhat more transparent and colored inside the crystal and black and polycrystalline on the surface. In matrix, with very sharp and lustrous crystals of Marcasite and iridescent Chalcopyrite on the base.
The specimen comes from a 2023 find in the Bou Nahas Mine where such large and sharp crystals of Sphalerite had not so far been reported.
Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region  Morocco (02/2023)

Specimen size: 12 × 9.8 × 5.8 cm = 4.72” × 3.86” × 2.28”