digenite


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digenite

[′dī·jə‚nīt]
(mineralogy)
Cu9S5 A blue to black mineral consisting of an isometric copper sulfide having a variable deficiency in copper. Also known as alpha chalcocite; blue chalcocite.
References in periodicals archive ?
The surface mineralisation at BEP and BWP comprises chalcocite, covellite and digenite mineralisation with lesser chalcopyrite.
Copper sulphides such as CuS (covellite), [Cu.sub.1.75]S (anilite), [Cu.sub.1.8]S (digenite), [Cu.sub.1.95]S (djurlite), and [Cu.sub.2]S are of great interest as they can be applied in energy storage, owing to their variations in stoichiometric compositions, complex structures, and valence states [11].
There are five stable phases of [Cu.sub.x]S at room temperature which vary according to values of x (1 [less than or equal to] x [less than or equal to] 2): chalcocite ([Cu.sub.2]S), djurleite ([Cu.sub.1.95]S), digenite ([Cu.sub.1.8]S), anilite ([Cu.sub.1.75]S), and covellite (CuS) [8, 9].
It was concluded that tetrahedrite decomposes into iron (or zinc) rich tetrahedrite, antimony, famatinite, and digenite. It was also reported that the Cu-Sb-S alloy system is less stable compared to the iron (or zinc) bearing CAS alloy system at room temperature [5].
Minerals associated with cubic magnetite at Balmat, New York Anhydrite [CaSO.sub.4] Arsenopyrite FeAsS Atacamite [Cu.sub.2][Cl(OH).sub.3] Betekhtinite [Cu.sub.10](Pb,Fe)[S.sub.6] Bornite [Cu.sub.5][FeS.sub.4] Bottallackite [Cu.sub.2]Cl[(OH).sub.3] Calcite [CaCO.sub.3] Celestine [SrSO.sub.4] Chalcocite [Cu.sub.2]S Chalcopyrite [CuFeS.sub.2] Digenite [Cu.sub.9][S.sub.5] Galena PbS Gordaite [NaZn.sub.4]([SO.sub.4])[(OH).sub.6]Cl*6[H.sub.2]O Halite NaCl Hematite [Fe.sub.2][O.sub.3] Malachite [Cu.sub.2]([CO.sub.3])[(OH).sub.2] Nantokite CuCl Namuwite [(Zn,Cu).sub.4][SO.sub.4][(OH).sub.6]*4[H.sub.2]O Paratacamite [Cu.sub.2]Cl[(OH).sub.3] Pyrite [FeS.sub.2] Silver Ag Sphalerite ZnS Talc [Mg.sub.3][Si.sub.4][O.sub.10][(OH).sub.2] Crystal Sizes
The powder diffraction pattern was consistent with the digenite phase of copper sulfide that has a stoichiometry of [Cu.sub.9][S.sub.5] or [Cu.sub.1.8]S.
Dominant sulphide minerals are chalcopyrite, pyrite and bornite with subordinate chalcocite and digenite. Sulphide content is low, averaging less than 1% overall.
Today the Butte mines are closed and flooded, but its mineralogical legacy of fine specimens remains--most noteably the copper sulfide and sulfosalt minerals such as bornite, chalcocite, chalcopyrite, colusite, covellite, digenite, djurleite, and enargite, and other minerals such as barite, pyrite, quartz and silver.
The predominant economic sulphide minerals are chalcocite, digenite, bornite, carrollite and chalcopyrite.