Mineral Information and Data:

Molybdenite
MoS2 [CNMNC approved formula]

Named for a word derived from the Greek molybdos, lead.

IMA status : Valid species (Pre-IMA 1807) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
02.12.10.01  
  (02) Sulfides - Including Selenides and Tellurides
  (02.12) where Am Bn Xp, with (m+n):p=1:2
  (02.12.10) Molybdenite Group
  
Nickel-Strunz
(10th edition) :
02.EA.30
  (02) Sulfides
  (02.E) Metal Sulfides, M:S = 1:2
  (02.EA) M:S = 1:2
  
Crystal system: Hexagonal System
Point group (H-M): 6/mmm (or 6/m 2/m 2/m) — dihexagonal-dipyramidal
Unit cell: a = 3.161 Å, c = 12.30 Å
Crystal Habit: Crystals thin to thick tabular, hexagonal aspect; short barrel-shaped prisms; foliated or radiate masses; scales; grains
  
Color: Lead-gray
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 1 to 1.5
Measured Density: 4.62 to 5.06 g/cm3
Cleavage: 1; {0001} perfect, easy
Tenacity: Sectile
Fracture: Lamellae flexible, not elastic
Streak: Bluish gray
  
Polymorphism and Series: Dimorphous with jordisite;
polytypes: 2H1 and 3R are known.
Geologic Setting: In high-temperature hydrothermal veins. In disseminated deposits of the porphyry type, both with and without associated major copper mineralization. Also in contact metamorphic deposits in limestone with calcium silicate minerals as well as in pegmatites, granites, and aplites. Rarely in meteorites
Mineral Association: Chalcopyrite, other copper sulfides
Ore deposits: The primary ore mineral of molybdenum.
  
Synonyms/varieties: Plumbago
Comments: Data above are for molybdenite-2H;

 

Molybdenite
Origin: near Babu/Hezhou, Guangxi Zhuaug A. R., China
Sample size: 6.5 x 5 x 1.5 cm
Photo: Tom Loomis

 

Molybdenite
(zoom-in of above)

 

Molybdenite
Origin: Mont St. Hilaire, Quebec, Canada
Sample size: 5 x 4 x 2 cm
Photo: Tom Loomis

 

Molybdenite
(zoom-in of above)

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