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Molybdenite

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Formula:
MoS2
Colour:
Black, lead gray, or gray
Lustre:
Metallic
Hardness:
1 - 1½
Specific Gravity:
4.62 - 4.73
Crystal System:
Hexagonal
Name:
Variations of the name molybdaena and molybdenite were used for lead ores by Dioscorides (50-70 CE), Pliny the Elder (79 CE), and Agricola (1556), but the modern use of molybdenite did not begin until Johan Gottschalk Wallerius wrote about molybdenite in Mineralogia, eller Mineralriket published in 1747. There was still a multiplicity of minerals receiving the same name, but modern molybdenite and graphite were the most common minerals given this name. The element molybdenum was discovered by Carl Wilhelm Scheele in 1778 and he provided molybdenite to Peter Jacob Hjelm who was able to isolate molybdenum in 1781. Scheele showed that molybdenite, in the modern sense, was soluble in acid, while graphite was not. From the Greek μόλυβδοζ meaning "lead", but a name having a new usage unlike that of former times.
Molybdenite is the most important ore of the metal molybdenum. Molybdenite is currently being researched as a possible replacement semiconductor for silicon in transistors in electronic chips.

Two polytypes are known: molybdenite-2H (very common) and molybdenite-3R (rare).


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Classification of MolybdeniteHide

Approved, 'Grandfathered' (first described prior to 1959)
2.EA.30

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
A : M:S = 1:2 - With Cu, Ag, Au
Dana 7th ed.:
2.12.10.1
2.12.10.1

2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
3.8.6

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
8 : Sulphides etc. of Cr, Mo, W an Mn

Physical Properties of MolybdeniteHide

Metallic
Transparency:
Opaque
Colour:
Black, lead gray, or gray
Comment:
Pale yellow to deepish reddish brown in transmitted light
Streak:
Bluish gray
Hardness:
1 - 1½ on Mohs scale
Tenacity:
Flexible
Cleavage:
Perfect
Perfect on {0001}
Density:
4.62 - 4.73 g/cm3 (Measured)    4.998 g/cm3 (Calculated)

Optical Data of MolybdeniteHide

Type:
Anisotropic
Anisotropism:
Very strong
Pleochroism:
Strong

Chemical Properties of MolybdeniteHide

Formula:
MoS2
CAS Registry number:
1317-33-5

CAS Registry numbers are published by the American Chemical Society

Age distributionHide

Recorded ages:
Mesoarchean to Quaternary : 2910 Ma to Ma - based on 493 recorded ages.

Crystallography of MolybdeniteHide

Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:
P63/mmc
Cell Parameters:
a = 3.16 Å, c = 12.3 Å
Ratio:
a:c = 1 : 3.892
Unit Cell V:
106.37 ų
Z:
2
Morphology:
Tabular crystals, flakes

Crystallographic forms of MolybdeniteHide

Crystal Atlas:
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Molybdenite - Tabular {001}
Molybdenite - Thick tabular {001}
3d models and HTML5 code kindly provided by www.smorf.nl.

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Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

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X-Ray Powder DiffractionHide

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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Other Language Names for MolybdeniteHide

Varieties of MolybdeniteHide

FemoliteProbably a ferrian Molybdenite or a mixture
Rhenian MolybdeniteA rhenium-bearing variety of molybdenite (320 to 580 ppm Re - among highest known, Childs-Adwinkle Mine)

Relationship of Molybdenite to other SpeciesHide

Other Members of this group:
DrysdalliteMo(Se,S)2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
TungsteniteWS2Trig. 3m : R3m

Common AssociatesHide

Associated Minerals Based on Photo Data:
Quartz218 photos of Molybdenite associated with Quartz on mindat.org.
Ferrimolybdite42 photos of Molybdenite associated with Ferrimolybdite on mindat.org.
Fluorite38 photos of Molybdenite associated with Fluorite on mindat.org.
Pyrite35 photos of Molybdenite associated with Pyrite on mindat.org.
Calcite25 photos of Molybdenite associated with Calcite on mindat.org.
Chalcopyrite24 photos of Molybdenite associated with Chalcopyrite on mindat.org.
Scheelite23 photos of Molybdenite associated with Scheelite on mindat.org.
Muscovite23 photos of Molybdenite associated with Muscovite on mindat.org.
Powellite20 photos of Molybdenite associated with Powellite on mindat.org.
Bismuth19 photos of Molybdenite associated with Bismuth on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.EA.05Sylvanite(Au,Ag)2Te4Mon. 2/m : P2/b
2.EA.10CalaveriteAuTe2Mon.
2.EA.15KostoviteCuAuTe4Orth.
2.EA.15KrenneriteAu3AgTe8Orth. mm2 : Pma2
2.EA.20BerndtiteSnS2Trig. 3m (3 2/m) : P3m1
2.EA.20KitkaiteNiTeSeTrig.
2.EA.20MeloniteNiTe2Trig.
2.EA.20Merenskyite(Pd,Pt)(Te,Bi)2Trig. 3m : P3m1
2.EA.20Moncheite(Pt,Pd)(Te,Bi)2Trig.
2.EA.20ShuangfengiteIrTe2Trig.
2.EA.20SudovikovitePtSe2Trig.
2.EA.25VerbeekitePdSe2Mon.
2.EA.30DrysdalliteMo(Se,S)2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.EA.30JordisiteMoS2
2.EA.30TungsteniteWS2Trig. 3m : R3m

Related Minerals - Dana Grouping (8th Ed.)Hide

2.12.10.2DrysdalliteMo(Se,S)2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.12.10.3TungsteniteWS2Trig. 3m : R3m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

3.8.1BrezinaiteCr3S4Mon. 2/m
3.8.2CaswellsilveriteNaCrS2Trig. 3m (3 2/m) : R3m
3.8.3KalininiteZnCr2S4
3.8.4DaubréeliteFe2+Cr3+2S4Iso. m3m (4/m 3 2/m) : Fd3m
3.8.5Heideite(Fe,Cr)1.15(Ti,Fe)2S4Mon. 2/m
3.8.7 Molybdenite-3RMoS2Trig. 3m : R3m
3.8.8JordisiteMoS2
3.8.9DrysdalliteMo(Se,S)2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
3.8.10TungsteniteWS2Trig. 3m : R3m
3.8.12AlabanditeMnSIso. m3m (4/m 3 2/m) : Fm3m
3.8.13HaueriteMnS2Iso. m3 (2/m 3) : Pa3
3.8.14Manganoshadlunite(Mn,Pb,Cd)(Cu,Fe)8S8

Other InformationHide

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

Molybdenite in petrologyHide

An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.

References for MolybdeniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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: 328-331.
American Mineralogist (1963) 48: 1419.
Schweizerische mineralogische und petrographische Mitteilungen (1964) 44: 123.
Frondel, J.W. & Wickman, F.E. (1970) Molybdenite polytypes in theory and occurrence. II: Some naturally occurring polytypes of molybdenite. American Mineralogist 55, 1857-1875.
Schonfeld, B.; Huang, J.J.; Moss, S.C. (1983) Anisotropic mean-square displacements (MSD) in single crystals of 2H- and 3R-MoS2. Acta Crystallogr. B39, 404–407.
Golden, J., McMillan, M., Downs, R.T., Hystad, G., Goldstein, I., Stein, H.J., Zimmerman, A., Sverjensky, D.A., Armstrong, J.T., Hazen, R.M. (2013) Rhenium variations in molybdenite (MoS2): Evidence for progressive subsurface oxidation. Earth and Planetary Science Letters, 366, 1-5.

Internet Links for MolybdeniteHide

Localities for MolybdeniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListShow