Table T4. Chemical formulae of sulfide minerals identified during Expedition 331.

Mineral Composition
Pyrite FeS2
Pyrrhotite Fe1–xS
Chalcopyrite CuFeS2
Covellite CuS
Sphalerite (Zn,Fe)S
Wurtzite ZnS
Galena PbS
Tennantite (Cu,Fe,Zn.Ag)12As4S13
Tetrahedrite (Cu,Fe,Zn.Ag)12Sb4S13
Sulfosalt A class of sulfide minerals in which a semimetal (As or Sb) takes the place of one or more S atoms in the structure. Tennantite and tetrahedrite are important examples, and Pb and Ag commonly form sulfosalts.