Zinkenite


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zinkenite

[′ziŋ·kə‚nīt]
(mineralogy)
Pb6Sb14S27 A steel-gray orthorhombic mineral consisting of a lead antimony sulfide and occurring in crystals and in masses; has metallic luster, hardness of 3-3.5 on Mohs scale, and specific gravity of 5.30-5.35. Also spelled zinckenite.

Zinkenite

 

(named after the German mineralogist K. Zinken, who died in 1862), a mineral, a complex lead sulfide with the chemical composition PbSb2S4. Zinkenite, which usually contains admixtures of Fe, Cu, Ag, and As, crystallizes in the hexagonal system. It forms continuous granular masses, acicular crystals, and radiated aggregates. It is steel gray and iridescent and has a metallic luster. A brittle mineral, it has a hardness of 3–3.5 on Mohs’ scale and a density of about 5,300 kg/m3. Zinkenite is found in low-temperature and medium-temperature hydrothermal antimony and antimony-complex ore deposits, where it is associated with antimonite, sphalerite, and other minerals.

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References in periodicals archive ?
Relationship to other species: Among lead sulfosalts, scainite belongs to the zinkenite group of cyclically twinned structures and their derivatives.
Zinkenite was listed by Jaskolski (1933) as a late-stage hydrothermal mineral at Cerro Rico.
Some crystals may be thicker, stiffer and more brittle, and do not show the striations which are typical of zinkenite.
The length-to-diameter ratio of the crystals is not as large as for boulangerite and zinkenite.
The few specimens recorded have been found in the Ceragiola and Pitone areas; it is normally associated with zinkenite, stibnite and bournonite.
Marcasite is very rare, occurring as poorly formed, very brittle tabular metallic crystals; it has been found in association with zinkenite in the Ceragiola quarries.
1 mm occur occasionally on partly altered zinkenite crystals.
Sometimes zinkenite has an alteration patina dulling its typical metallic luster.
Denis Gravier (Chemin de Ronde, 01500 Ambronay, France) has acquired some excellent zinkenite specimens from the Serre farm area, Saint Pons, Haute Province.