Millerite

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millerite

[′mil·ə‚rīt]
(mineralogy)
NiS A brass to bronze-yellow mineral that crystallizes in the hexagonal system and usually contains trace amounts of cobalt, copper, and iron; hardness is 3-3.5 on Mohs scale, and specific gravity is 5.5; it generally occurs in fine crystals, chiefly as nodules in clay ironstone. Also known as capillary pyrites; hair pyrites; nickel pyrites.

Millerite

 

(named after the British crystallographer W. Miller [1801–80]), a mineral of the sulfide class; nickel sulfide, NiS, containing 64.7 percent Ni and 35.3 percent S. Millerite crystallizes in the trigonal system, forming characteristic slender brass-yellow hairlike crystals. It also forms fibrous, radiating, and other kinds of aggregates. Millerite has a hardness of 3–4 on Mohs’ scale and a density of 5,200–5,600 kg/m3. It occurs rarely in nature, usually in hydrothermal ore veins in association with other Ni and Co sulfides and arsenides, which are contained in copper-nickel ores (in Noril’sk and Monchegorsk in the USSR). Millerite is also formed during the sur-face weathering of nickel-bearing ultrabasic rocks by acidic surface waters saturated with H2S.

REFERENCE

Mineraly: Spravochnik, vol. 1. Moscow, 1960.
References in periodicals archive ?
3), the supergene profile of the 132 North nickel mineralization can be divided into five zones, four of which are common to many of the profiles of nickel sulfide deposits in the Kambalda area (Woodall and Travis, 1969; Thornber, 1972; Nickel et al.
The primary nickel sulfide mineralization consists of a typical Kambalda-style profile (Cowden and Roberts, 1990): a layer of massive sulfides (>80% sulfides), 0.
The smelter produces blister copper (98% Cu) for shipment to the copper refinery and a slow-cooled Bessemer matte (75% Cu + Ni) which is separated at the matte separation plant into nickel sulfides (mainly heazlewoodite), metallics and copper sulfide (chalcocite).
He was one of the first scientists to suggest that iron sulfides and nickel sulfides might have held an important role in early life.
9 billion worth of mixed nickel sulfides (down 19 percent).
Additional laboratory and geochemical studies are underway to determine whether the mineralization zones intersected in these drill holes could represent a very large deposit of disseminated nickel sulfides.