Marcasite (Sperkise twinn) with Pyrite

Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region  Morocco (2020)

Specimen size: 20.1 × 12.7 × 9.9 cm = 7.91” × 5.00” × 3.90”
Main crystal size: 1.5 × 1 cm = 0.59” × 0.39”