Cubanite

cubanite

[′kyü·bə‚nīt]
(mineralogy)
CuFe2S3 Bronze-yellow mineral that crystallizes in the orthorhombic system. Also known as chalmersite.
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 It might be outdated or ideologically biased.

Cubanite

 

a mineral, a sulfide of iron and copper, Cul’e2S3 (theoretical content: 23.4 percent Cu, 41.2 percent Fe, 35.4 percent S). Cubanite crystallizes in the orthorhombic system. It generally forms thin tabular microscopic intergrowths in chalcopyrite—products of decomposition at a temperature of about 300°C. Cubanite is bronze-yellow in color and exhibits a metallic luster. It has a hardness of 3.5 on the mineralogical scale and a density of 4,030–4,169 kg/m3. It is magnetic. Cubanite occurs in copper-nickel sulfide ore deposits (for example, in Sudbury, Canada). It is a rare mineral and does not form large aggregates.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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These include acicular cubanite crystals a few millimeters long, similar in appearance to millerite, and crude, embedded crystals of native platinum to 8 mm.
The vehicle is available in Carneol Red, Obsidian Black, Calcite White, Tenorite Grey, Iridium Silver and Cubanite Silver colours.
Cubanite Silver paint is available as an exclusive finish, although any of the M-Class metallic paints can be chosen at no extra cost.
The geologic history of this deposit[4] begins with the intrusion of stocks of tonalitic composition (the Andacollo porphyry, Upper Cretacous) within a layered sequence of andesite and dacites, which induced pervasive hydrothermal alteration (K silicate, quartz sericite) and mineralization (mainly pyrite-chalcopyrite plus some minor quantities of molybdenite, bornite, cubanite and pyrrhotite).
Pyrite, pentlandite, monoclinic pyrrhotite and chalcopyrite are dominant in the lower zone of the Platreef, whereas pentlandite, hexagonal pyrrhotite and chalcopyrite ([+ or -] cubanite) predominate in the upper zone (Gain and Mostert, 1982).
Some exceptional mineral specimens worth noting include a unique skeletal octahedral gold crystal from the Van Dyks mine; the finest pyrrhotite and cubanite from southern Africa, collected at the Mponeng mine during 2002-2003; the largest barite crystals in the world, found at the Elandsrand gold mine; and a host of outstanding quartz specimens from several of the Witwatersrand mines.
Associated minerals are: chalcopyrite, a chalcopyrite-like sulphide (e.g., mooihoekite, talnakhite or putoranite), pentlandite, pyrrhotite, cubanite, galena, talmyrite, cabriite, stannopalladinite, atokite-rustenburgite, paolovite, froodite, sperrylite, maslovite, Ag-Au alloy, Fe-rich hydrous silicate, magnetite and calcite.
Cubanite is a rare accessory mineral associated with other sulfides at the First Sovietskiy and Nikolaevskiy mines.