Berryite

Sulfosalt mineral

Berryite
Black acicular crystals of the rare Pb-Ag sulfide from a Colorado locality: Mike Mine, San Juan County, Colorado, United States
General
Category	Minerals
Formula	Cu₃Ag₂Pb₃Bi₇S₁₆
IMA symbol	Bry^[1]
Strunz classification	2.HB.20d (10th)
Dana classification	3.6.15.1
Crystal system	Monoclinic
Crystal class	2/m (Prismatic)
Unit cell	1,445.93 Å³
Identification
Colour	Bluish-grey, white, grey-white
Twinning	Repeated
Cleavage	Poor/indistinct
Mohs scale hardness	3.5
Luster	Metallic
Diaphaneity	Opaque
Specific gravity	6.7
Density	6.7 g/cm³ (measured)
Pleochroism	Weak

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 G. 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.