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Millerite
Millerite
is a nickel sulfide mineral, NiS. It is brassy in colour and has an acicular habit, often forming radiating masses and furry aggregates. It can be distinguished from pentlandite by crystal habit, its duller colour, and general lack of association with pyrite or pyrrhotite.

Contents

1 Paragenesis 2 Economic importance 3 Occurrence 4 See also 5 References 6 External links

Paragenesis[edit] Millerite
Millerite
is a common metamorphic mineral replacing pentlandite within serpentinite ultramafics. It is formed in this way by removal of sulfur from pentlandite or other nickeliferous sulfide minerals during metamorphism or metasomatism. Millerite
Millerite
is also formed from sulfur poor olivine cumulates by nucleation. Millerite
Millerite
is thought to form from sulfur and nickel which exist in pristine olivine in trace amounts, and which are driven out of the olivine during metamorphic processes. Magmatic olivine generally has up to ~4000 ppm Ni and up to 2500 ppm S within the crystal lattice, as contaminants and substituting for other transition metals with similar ionic radii (Fe2+ and Mn2+).[citation needed]

Millerite
Millerite
structure

During metamorphism, sulfur and nickel within the olivine lattice are reconstituted into metamorphic sulfide minerals, chiefly millerite, during serpentinization and talc carbonate alteration. When metamorphic olivine is produced, the propensity for this mineral to resorb sulfur, and for the sulfur to be removed via the concomittant loss of volatiles from the serpentinite, tends to lower sulfur fugacity. This forms disseminated needle like millerite crystals dispersed throughout the rock mass. Millerite
Millerite
may be associated with heazlewoodite and is considered a transitional stage in the metamorphic production of heazlewoodite via the above process. Economic importance[edit] Millerite, when found in enough concentration, is a very important ore of nickel because, for its mass as a sulfide mineral, it contains a higher percentage of nickel than pentlandite. This means that, for every percent of millerite, an ore contains more nickel than an equivalent percentage of pentlandite sulfide. Millerite
Millerite
forms an important ore constituent of the Silver Swan, Wannaway, Cliffs, Honeymoon Well, Yakabindie and Mt Keith (MKD5) orebodies. It is an accessory mineral associated with nickel laterite deposits in New Caledonia. Occurrence[edit]

Lustrous mass of intergrown millerite needles from Kalgoorlie, Western Australia. (size: 3.9 x 3.5 x 2.2 cm)

Millerite
Millerite
is found as a metamorphic replacement of pentlandite within the Silver Swan nickel deposit, Western Australia, and throughout the many ultramafic serpentinite bodies of the Yilgarn Craton, Western Australia, generally as a replacement of metamorphosed pentlandite. There is one known occurrence of millerite in South Africa, near Pafuri in the Transvaal. The deposit has never been commercially mined.[6] It is commonly found as radiating clusters of acicular needle-like crystals in cavities in sulfide rich limestone and dolomite or in geodes. It is also found in nickel-iron meteorites, such as CK carbonaceous chondrites.[7] Millerite
Millerite
was discovered by Wilhelm Haidinger
Wilhelm Haidinger
in 1845 in the coal mines of Wales. It was named for British mineralogist William Hallowes Miller. The mineral is quite rare in specimen form, and the most common source of the mineral is in the Halls Gap area of Lincoln County, Kentucky in the United States. See also[edit]

List of minerals List of minerals
List of minerals
named after people Nickel
Nickel
Mines, Pennsylvania

References[edit]

^ Mineralienatlas ^ http://rruff.geo.arizona.edu/doclib/hom/millerite.pdf Handbook of Mineralogy ^ http://www.mindat.org/min-2711.html Mindat ^ http://webmineral.com/data/Millerite.shtml Webmineral ^ Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., pp. 279-280, ISBN 0-471-80580-7 ^ "Millerite". Cape Minerals. Retrieved 7 February 2017.  ^ Geiger, T.; Bischoff, A. (1995). "Formation of opaque minerals in CK chondrites". Planetary and Space Science. 43 (3–4): 485–498. Bibcode:1995P&SS...43..485G. doi:10.1016/0032-0633(94)00173-O. 

External links[edit]

Wikimedia Commons has media related to Millerite.

Mineral galleries Wisconsin minerals University of Kentucky, Kentucky Geological Survey, Sulfide Minerals

v t e

Sulfur
Sulfur
compounds

Al2S3 As2S2 As2S3 As5S2 As4S4 Au2S3 B2S3 BaS BeS Bi2S3 Br2S Br2S2 CS2 C3S2 CaS CdS CeS SCl2 S2Cl2 CoS Cr2S3 CuS D2S Dy2S3 Er2S3 EuS SF4 SF6 FeS2 GaS H2S HfS2 HgS InS I2S LaS LiS MgS MoS3 NiS SO2 SO3 P4S7 PbS PbS2 PtS ReS2 SrS TlS SV SeS2 S2U WS2 Sb2S3 Sb2S5 Sm2S3 Y2S3 Ag2SO4 SOBr2 CSTe C2H4S C2H6S3 C4H4S CaSO4 C32H66S2 CuFeS2 H2SO4 H2SO3 F2OS NaHS K2SO3 O3S3Sb4 Yb2(SO4)3 AlKO8S2 CHCl3S KSCN CdSO3 PSCl3 SOCl2 Cs2O4S Re2S7 Na2S K2S H2S2O7 H2SO5 NH5S HgSO4 K2SO4 RaSO4 SnSO4 SrSO4 Zr(SO4)2 Ti(SO4)2 Tm2(SO4)3 AlNa(SO4)2 Er2(SO4)3 Eu2(SO4)3 CHNS Co(SCN)2 C2H3SN PSI3 ZrS2 SiS CSSe

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