18TGM66: Aggregate of very sharp Sphalerite crystals (variety marmatite), with very distinct spinel-law twinning, an intense black color, very lustrous, partially covered by cream-colored botryoidal Rhodochrosite crystals. Finally, partially covering the piece, there are white lenticular Calcite crystals with sharp rhombohedral terminations. The Trepča mining complex is one of the largest polymetallic deposits in the world and for many years produced exceptional specimens of Sphalerite as well as varied combinations of sulfides and carbonates, as shown in this specimen.
Stan Trg (Stari Trg) Mine, Trepča Complex, Trepča Valley, Kosovska Mitrovica, Kosovska Mitrovica District  Kosovo (2000-2021)

Specimen size: 8.6 × 6.8 × 2.5 cm = 3.39” × 2.68” × 0.98”

Main crystal size: 1.1 × 0.8 cm = 0.43” × 0.31”