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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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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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. Curved or curled crystals forming small rings and cylinders are not uncommon.
The length-to-diameter ratio of the crystals is not as large as for boulangerite and zinkenite. The black color and metallic luster aid in visual identification of this mineral from boulangerite and zinkenite, which are lead-gray.
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.
Sprays of milk-white crystals of mimetite up to 0.1 mm occur occasionally on partly altered zinkenite crystals.
Zinkenite is uncommon in all the Seravezza quarries.
At Seravezza, the mineralization may also occur as epithermal vein formations including the association of several sulfides (pyrite, sphalerite, galena) and sulfosalts (boulangerite, zinkenite, guettardite, etc.) which sometimes completely fill the marble clefts.