Molybdenite


Composition: MoS2
Crystal System : Hexagonal; Trigonal
Colours: Bluish lead-grey
Lustre : Metallic
Hardness (H) : 1.0-1.5
Specific Gravity (S.G) : 4.62-4.80
References:

Bartelke (1976)

Distribution

Very rare. Generally in polished section, but rarely as free-standing crystals (?).

Occurrence

  • Hypogene
  • 2nd Oxidation Zone

Paragenetic and General Notes

Microscopic inclusions of molybdenite in germanite are responsible for the c. 0.03% Mo detected in germanite ore by Kriesel (1924; cited in Bartelke, 1976).

Bartelke also records a specimen with a 5 mm crystal of molybdenite associated with stottite and schneiderhöhnite. Pinch and Wilson (1977) indicate that a specimen with a 30 mm hexagonal, pyramidal crystal, with stottite and schneiderhöhnite is known, but this seems questionable and may be a misinterpretation of Bartelke's observation.

Geier and Ottemann (1971a) noted molybedinite intergrown with tungstenite in crypto-crystalline bands.

Gebhard (1999) states that molybdenite has only been observed in polished section.