Berryite

Sulfosalt mineral
(repeating unit)Cu3Ag2Pb3Bi7S16IMA symbolBry[1]Strunz classification2.HB.20d (10th)Dana classification3.6.15.1Crystal systemMonoclinicCrystal class2/m (Prismatic)Unit cell1,445.93 Å3IdentificationColourBluish-grey, white, grey-whiteTwinningRepeatedCleavagePoor/indistinctMohs scale hardness3.5LusterMetallicDiaphaneityOpaqueSpecific gravity6.7Density6.7 g/cm3 (measured)PleochroismWeak

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

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  • Webmineral data
  • Mindat with location data
  • Mineral Data Publishing - PDF


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