Locality: Potosí Mine, Francisco Portillo, West Camp, Santa Eulalia Mining District, Aquiles Serdán Municipality, Chihuahua, Mexico
Size: 50 mm x 41 mm x 18 mm (2 in. x 1.6 in. x 0.7 in.)
Weight: 35 g (1.2 oz.)
Specimen of dark gray galena with clear and white quartz to 5 mm, partly covered in areas by a layer of white calcite.