Berryite is a mineral with the formula . It occurs as gray to blue-gray monoclinic prisms. It is opaque and has a metallic luster. It has a Mohs hardness of 3.5 and a specific gravity of 6.7. It was first identified in 1965 using X-ray diffraction by mineralogist Leonard Gascoigne Berry (1914–1982). It is found in Park and San Juan counties in Colorado. It occurs in sulfide bearing quartz veins in Colorado and with siderite-rich cryolite in Ivigtut, Greenland. References Webmineral data Mindat with location data Mineral Data Publishing - PDF Lead minerals Silver minerals Copper(I) minerals Bismuth minerals Sulfosalt minerals Monoclinic minerals Minerals in space group 11