Germanite


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germanite

[′jər·mə‚nīt]
(mineralogy)
Cu3(Ge,Ga,Fe)(S,As)4 Reddish-gray mineral occurring in massive form; an important source of germanium.

Germanite

 

a mineral of the group of complex sulfides; chemical composition Cu3(Fe,Ge)S4. The germanium content is 7-10 percent; insignificant amounts of zinc, lead, gallium, and arsenic are present. Most researchers attribute germanite to the cubic (or pseudocubic) system. Crystals are unknown.

Germanite is usually found in the form of separate nodules, exudations, or solid bodies in close association with pyrite, gray copper ores, sphalerite, or galena. It is brownish pink with violet shadings and is opaque, with a metallic luster. Its hardness on the mineralogical scale is 4.0; density, 4,400-4,600 kg/m3. It has been discovered in hydrothermal copper-polymetallic deposits. It is an important source of germanium. The only known commercial deposit is located at Tsumeb in Namibia (South West Africa).

G. P. BARSANOV

References in periodicals archive ?
The presence of gallium in germanite from Tsumeb has been known since 1922 (Strunz et al., 1958).
Germanite [Cu.sub.26][Fe.sub.4][Ge.sub.4][S.sub.32]
Germanite is rare at Kipushi, even though it is the main Ge-bearing mineral at Tsumeb; according to the view of Viaene and Moreau (1968), this is because Kipushi is too iron-rich to allow the formation of much germanite, the Ge-sulfide with the lowest iron content.
(1974) report that tungstenite lamellae are always present near germanite, having probably been deposited when renierite replaced germanite, considering that renierite does not accept W in its structure as germanite does.
(1968) Contribution a l'etude de la germanite, de la renierite et de la briartite.