pentlandite


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Related to pentlandite: garnierite, pyrrhotite

pentlandite

(pĕnt`ləndīt), yellowish-bronze, opaque mineral, a sulfide of iron and nickel, (Fe,Ni)9S8. It is found in masses nearly always associated with the iron sulfide pyrrhotite. The largest deposit of this important ore of nickel is at Sudbury, Ont. Important deposits are mined in Manitoba, Russia, and W Australia.

Pentlandite

 

(named after the British traveler J. Pentland [1797–1873], who first discovered the mineral), a nickel-iron pyrite; a mineral with the chemical composition (Fe, Ni)9S8. It contains, by weight, 32.55 percent Fe, 34.22 percent Ni, and 32.23 percent S. It also generally contains a 3-percent admixture of Co. A variety of pentlandite containing up to 49 percent Co is known as cobalt pentlandite.

Pentlandite crystallizes in the isometric system and exhibits octahedral parting. The crystal lattice is composed of eight tetrahedrons with common edges; four tetrahedrons contain Fe2+ ions, and the remaining four contain Ni2+ ions. Similar groups are, in turn, bonded at common apices and arranged at the corners of the face-centered cubic lattice. The ions Fe2+ and Ni2+, occurring in octahedral coordination relative to the S ions, are located between the tetrahedral groups.

Pentlandite has a metallic luster, a light bronze-yellow color, a hardness on Mohs’ scale of 3–4, and a density of 4,500–5,185 kg/m3. It occurs in the form of massive or granular aggregates in sulfide-ore deposits genetically associated with basic and ultrabasic igneous rocks, such as gabbro-norites and pyroxenites. Pentlandite is one of the principal minerals of nickel ores.

pentlandite

[′pent·lən‚dīt]
(mineralogy)
(Fe,Ni)9S8 A yellowish-bronze mineral having a metallic luster and crystallizing in the isometric system; hardness is 3.5-4 on Mohs scale, and specific gravity is 4.6-5.0; the major ore of nickel.
References in periodicals archive ?
Selective leaching of nickel from the copper flotation concentrate was possible due to the development of galvanic couple between copper containing chalcopyrititic phase and nickel containing pentlandite.
This suggested that pentlandite was oxidized in parallel with pyrrhotite.
Massive sulphide mineralisation identified at Radio Hill sits very close to the basal part of the intrusion and comprises pyrrhotite, chalcopyrite and pentlandite.
Pyrrhotite occurs as coarse crystals with flame exsolutions of pentlandite and surrounded by polycrystalline, chain-like pentlandite aggregates, yielding similar textures to those observed in Sudbury ores.
Most of the nickel in the deposit is concentrated in the main nickel mineral, pentlandite, which will enable the mine to produce a high-grade concentrate of 15% Ni.
The massive sulphide mineralization is characterized by chalcopyrite-rich veins, with significant cubanite, pentlandite and millerite and is interpreted as being a 'sharp-walled' Cu-Ni-Pt-Pd-Au vein system.
Historic reports show that mineralization at E&L consists of disseminated and massive pyrrhotite, pentlandite and chalcopyrite hosted in an olivine gabbro stock that intrudes Lower Jurassic sediments and volcanics.
The peridotites in the region contain about 1% finely disseminated sulphide minerals, mainly pyrrhotite and pentlandite.
The sulphides, predominantly pyrrhotite, pentlandite, and chalcopyrite, contain the economic concentrations of platinum group metals, copper, nickel, gold, and cobalt.
Its mineralized system is characterized by chalcopyrite-rich veins, with significant cubanite, pentlandite and millerite and is interpreted as being a 'Sharp-walled' Cu-Ni-Pt-Pd-Au vein system.
Pentlandite was found in Fall 2001 as metallic, bronzy brown, granular veins up to 8 cm in maximum dimension with minor magnetite and coarse platy talc in serpentine from the east face, fourth level.
Due to the mineralogy of the ore, the potential of the pentlandite was usually too negative compared with the predetermined optimum point for the flotation with ethyl xanthate.