Berryite

Black acicular crystals of the rare Pb-Ag sulfide from a Colorado locality: Mike Mine, San Juan Co., Colorado, United States

Berryite is a mineral with the formula Pb₃(Ag,Cu)₅Bi₇S₁₆. 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