molybdenite


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molybdenite

(məlĭb`dənīt, mō–), a mineral, molybdenum disulfide, MoS2, blue-gray in color, with a metallic luster and greasy feel. It occurs in crystals of the hexagonal system but more commonly in scales, grains, or foliated or massive form. It has an excellent basal cleavage and the laminae are flexible. It is found in granites, syenites, gneisses, and crystalline limestones. Molybdenite is an important ore of molybdenum. The major sources are quartz veinlets in granite at Climax, Colo., and copper mines in Utah, New Mexico, and Arizona. Minor amounts are recovered in Mexico, Chile, Canada, and Norway.

Molybdenite

 

(molybdenum glance), a mineral of the sulfide class, with chemical composition MoS2, containing 60 percent Mo, 40 percent S, and a negligible quantity of Re (up to 0.33 percent). Molybdenite crystallizes in a hexagonal system to form crystal structures in which molybdenum atoms surrounded by six sulfur atoms are located in the center of trigonal prisms, whose apices are occupied by sulfur atoms. The trigonal prisms form layers that contain strong metal-covalent interatomic bonds. Weak residual van der Waals bonds are observed between layers. This distinct lamellar structure determines the habit of molybdenite crystals, which varies from tabular to squamous, and their perfect cleavage, [0001]. Molybdenite occurs as squamous or foliated aggregates and is steel-gray, with a bright metallic luster. Mineralogical hardness, 1.0–1.5; density, 4,620–4,800 kg/m3.

Molybdenite occurs in greisen deposits and, less frequently, in pegmatite deposits, where it exists in association with wolframite, topaz, cassiterite, fluorite, chalcopyrite, and pyrite. Large molybdenite deposits are located in contact-metasomatic garnetpyroxene skarns, as well as in hypothermal and mesothermal quartz-molybdenite ore veins. Molybdenite deposits are found in the Caucasus, Transbaikalia, Middle Asia, the USA (Climax, Colorado), Mexico, and Norway. Molybdenite is the most important constituent of molybdenum ores.

molybdenite

[mə′lib·də‚nīt]
(mineralogy)
MoS2 A metallic, lead-gray mineral that crystallizes in the hexagonal system and is commonly found in scales or foliated masses; hardness is 1.5 on Mohs scale, and specific gravity is 4.7; it is chief ore of molybdenum.
References in periodicals archive ?
Sharp hexagonal crystals of molybdenite to 15 cm, showing an unusual, dark metallic gray color, were recovered from one of the pegmatites near shaft 2 by Vsevolod Chornousenko.
Preparation and certification of Re-Os dating reference materials: molybdenite HLP and JDC // Geostandard and Geoanalytical Research.
Mineralization consists of megascopic and microscopic molybdenite, pyrite, minor chalcopyrite and rare bornite.
2006) Re-Os molybdenite and LA-ICPMS-MC U-Pb zircon geochronology for the Milpillas porphyry copper deposit: insights for the timing of mineralization in the Cananea District.
Pour limiter la petrogenese et le passe thermique de la pegmatite, on a preleve des echantillons de tantalite, de molybdenite et de muscovite en vue de datations U-Pb, Re-Os et [sup.
It is normally used as supplied or blended with complex alcohols and/or with hydrocarbons when any of the latter are required as collectors of molybdenite.
The nine discovery holes (5,400 m) drilled by Amarc in 2014 intersected long intervals of continuous chalcopyrite and molybdenite mineralization from surface and over a broad area, measuring 1,200 m by 500 m and to depths of approximately 500 m.
Mineralisation at the Attunga Copper Mine is interpreted to be sub-vertical and occurs in garnet-rich calc-silicate skarn with sulphide minerals including chalcopyrite, bornite and molybdenite.
Minor minerals contained in the cement of the breccia body at Schneckenstein include tourmaline, fluorite, wolframite, molybdenite, ilmenorutile, apatite, chalcopyrite, malachite, azurite, and (rarely) cassiterite, turquoise, pyrite, wavellite and gold.
The hypogene mineralisation is characterised by a mineral assemblage of pyrite, chalcopyrite, minor molybdenite and traces of bornite and other minor copper sulphide species.
LMC), one of the world's largest ferromolybdenum producers, and the first site to commercially convert molybdenite concentrates to technical molybdic oxide.
This led to the first dirt road up Mount Antero and Mount White in 1956, and the reopening of the California molybdenite mine adit in 1960.