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Millerite

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Formula:
NiS
System:
Trigonal
Colour:
Pale brass-yellow, with ...
Lustre:
Metallic
Hardness:
3 - 3½
Name:
Named by Wilhelm Haidinger in 1845 in honor of the English mineralogist, Professor William Hallowes Miller [April 6, 1801, Velindre, Wales, UK - May 20, 1880, Cambridge, England, UK], University of Cambridge, who first studied the crystals.
Commonly found as radiating and jackstraw clusters of shiny metallic acicular crystals, pale brass-yellow with an iridescent tarnish.

Compare 'UM1989-25-S:FeNi' - a representative of the Fe1-xS-Ni1-xS (Mss) solid solution.


Classification of Millerite

Approved, 'Grandfathered' (first described prior to 1959)
2.CC.20

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
C : With Ni, Fe, Co, PGE, etc.
Dana 7th ed.:
2.8.16.1
2.8.16.1

2 : SULFIDES
8 : AmXp, with m:p = 1:1
3.11.3

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
11 : Sulphides etc. of Ni

Physical Properties of Millerite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Pale brass-yellow, with an iridescent tarnish, and greenish-grey.
Streak:
Greenish black.
Hardness (Mohs):
3 - 3½
Hardness (Vickers):
VHN20=179 kg/mm2
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {1011} and {0112}.
Fracture:
Irregular/Uneven
Density:
5.3 - 5.5 g/cm3 (Measured)    5.374 g/cm3 (Calculated)

Optical Data of Millerite

Type:
Anisotropic
Anisotropism:
Strong
Pleochroism:
Weak
Comments:
Weak in air stronger in oil
Pale yellow-brown to bright yellow

Chemical Properties of Millerite

Formula:
NiS
Elements listed in formula:
Common Impurities:
Fe,Co,Cu

Crystallography of Millerite

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Cell Parameters:
a = 9.607 Å, c = 3.143 Å
Ratio:
a:c = 1 : 0.327
Unit Cell Volume:
V 251.22 ų (Calculated from Unit Cell)
Z:
9
Morphology:
Acicular crystals in radiating or jackstraw clusters; also massive.
Twinning:
None reported.

Crystallographic forms of Millerite

Crystal Atlas:
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Millerite - prismatic {100}
3d models and HTML5 code kindly provided by www.smorf.nl.

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Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

View
Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.81(60)
2.95(40)
2.78(100)
2.51(70)
2.23(60)
1.86(90)
1.82(50)
1.74(40)

Occurrences of Millerite

Type Occurrence of Millerite

Relationship of Millerite to other Species

2.CC.UM2007-26-S:CuFeIrNiPtRh(Ir,Cu,Ni,Pt,Rh,Fe)9S11
2.CC.05Achávalite(Fe,Cu)Se
2.CC.05BreithauptiteNiSb
2.CC.05FrebolditeCoSe
2.CC.05KotulskitePd(Te,Bi)
2.CC.05Langisite(Co,Ni)As
2.CC.05NickelineNiAs
2.CC.05Sederholmitebeta-NiSe
2.CC.05SobolevskitePd(Bi,Te)
2.CC.05StumpflitePt(Sb,Bi)
2.CC.05Sudburyite(Pd,Ni)Sb
2.CC.05JaipuriteCoS
2.CC.05ZlatogoriteNiCuSb2
2.CC.10PyrrhotiteFe7S8
2.CC.10Smythite(Fe,Ni)3+xS4 (x=0-0.3)
2.CC.10TroiliteFeS
2.CC.15CherepanoviteRhAs
2.CC.15Modderite(Co,Fe)As
2.CC.15Ruthenarsenite(Ru,Ni)As
2.CC.15Westerveldite(Fe,Ni,Co)As
2.CC.20Mäkineniteγ-NiSe
2.CC.20UM1990-38-S:CuFeIrNiPtRh(Ni,Fe,Rh,Cu,Ir,Pt)S
2.CC.25Mackinawite(Fe,Ni)9S8
2.CC.30Hexatestibiopanickelite(Pd,Ni)(Sb,Te)
2.CC.30VavříniteNi2SbTe2
2.CC.35aBraggite(Pt,Pd,Ni)S
2.CC.35bCooperitePtS
2.CC.35aVysotskite(Pd,Ni)S
3.11.1HeazlewooditeNi3S2
3.11.2Godlevskite(Ni,Fe)9S8
3.11.4PolydymiteNi2+Ni23+S4
3.11.5VaesiteNiS2
3.11.6ShanditeNi3Pb2S2
3.11.7DonharrisiteNi3HgS3
3.11.8ViolariteFe2+Ni23+S4
3.11.9Pentlandite(Fe,Ni)9S8
3.11.10Bravoite(Fe,Ni)S2
3.11.11SiegeniteCoNi2S4
3.11.12FletcheriteCu(Ni,Co)2S4
3.11.13Villamaninite(Cu,Ni,Co,Fe)S2
3.11.14Mäkineniteγ-NiSe
3.11.15Sederholmitebeta-NiSe
3.11.16TrüstedtiteNi3Se4
3.11.17WilkmaniteNi3Se4
3.11.18KulleruditeNiSe2
3.11.19Penroseite(Ni,Co,Cu)Se2
3.11.20TyrrelliteCu(Co3+,Ni3+)2Se4
3.11.21ImgreiteNiTe (?)
3.11.22MeloniteNiTe2
3.11.23KitkaiteNiTeSe
3.11.24Dienerite
3.11.25OrceliteNi5-xAs2, x ~ 0.25
3.11.26MaucheriteNi11As8
3.11.27NickelineNiAs
3.11.28RammelsbergiteNiAs2
3.11.29PararammelsbergiteNiAs2
3.11.30Nickelskutterudite(Ni,Co,Fe)As3
3.11.31OregoniteNi2FeAs2
3.11.32Westerveldite(Fe,Ni,Co)As
3.11.33Langisite(Co,Ni)As
3.11.34GersdorffiteNiAsS
3.11.35JolliffeiteNiAsSe
3.11.36BreithauptiteNiSb
3.11.38UllmanniteNiSbS
3.11.39Willyamite(Co,Ni)SbS

Other Names for Millerite

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Millerite

Reference List:
Palache, Charles, Harry Berman & Clifford Frondel (1944) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged, 834pp.: 239-241.

Canadian Mineralogist (1974) 12: 248-252, 253-257.

Gaines, Richard V., H. Catherine, W. Skinner, Eugene E. Foord, Brian Mason, Abraham Rosenzweig, Vandall T. King (1997) Dana's New Mineralogy: The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana: 81.

Nesbitt, H.W., Schaufuss, A.G., Scaini, M., Bancroft, G.M., and Szargan, R. (2001) XPS measurement of fivefold and six-fold coordinated sulfur in pyrrhotites and evidence for millerite and pyrrhotite surface species. American Mineralogist: 86: 318-326.

Internet Links for Millerite

mindat.org URL:
https://www.mindat.org/min-2711.html
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Specimens:
The following Millerite specimens are currently listed for sale on minfind.com.

Localities for Millerite

Mineral and/or Locality  
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