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.
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In order to ensure more complete dissolution of the abundant molybdenite in the samples and a more accurate determination of molybdenum, Dia Bras subsequently ordered all drill core samples from Corralitos to be analyzed by ME-ICP61 method, which utilizes a four-acid digestion process and results in a more complete dissolution of molybdenite, although complete dissolution is not guaranteed.
Preparation and certification of Re-Os dating reference materials: molybdenite HLP and JDC // Geostandard and Geoanalytical Research.
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When the TIMS ages are combined with new Re-Os dates (~ 410 Ma) from magmatic molybdenite at the western end of the batholith, it is apparent that Galway Granite plutonism extended discontinuously over a period of ca.
The breccia contains sedimentary and intrusive clasts in a hydrothermal and intrusive matrix which contains sulfides including chalcopyrite and molybdenite.
Mineralization at the Bee Creek prospect is hosted in hornfelsed sediments intruded by a multiphase diorite intrusive rock containing mineralized veins and disseminated chalcopyrite, molybdenite and pyrite.
Both holes intersected mineralized quartz veining with chalcopyrite, pyrrhotite, and molybdenite over several meters.
The Sonora region offers a wide range of mineral resources, both metallic and nonmetallic, highlighting their large deposits of copper and molybdenite, gold, silver, graphite, barite, tungsten, etc.
Highlights include drill results from the Troitsa copper and molybdenum zone, as well as the discovery of a new molybdenite showing.
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