Locality: Krushev Dol Mine (450 m level), Madan ore field, Smolyan Oblast, Bulgaria
Size: 50 mm x 38 mm x 29 mm (2 in. x 1.5 in. x 1.2 in.)
Weight: 87 g (3.1 oz.)
Highly lustrous cluster of sphalerite with gray galena, covered in areas by white calcite crystals. The sphalerite appears black under overhead lighting, but olive green and brown when backlit.