Locality: Uchucchacua Mine, Oyon Province, Lima Department, Peru
Size: 31 mm x 33 mm x 18 mm (1.2 in. x 1.3 in. x 0.7 in.)
Weight: 23 g (0.8 oz.)
Pyrargyrite (silver sulfantimonide) is a silver ore sometimes called ruby silver. This thumbnail specimen from the Uchucchacua Mine in Peru has black pyrargyrite to 5 mm on matrix. Other crystals best appreciated with magnification.