
1) Hexagonal mineral 2) Mineral 3) Sulfide mineral
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1) Ore
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Molybdenite is a mineral of molybdenum disulfide, MoS2. Similar in appearance and feel to graphite, molybdenite has a lubricating effect that is a consequence of its layered structure. The atomic structure consists of a sheet of molybdenum atoms sandwiched between sheets of sulfur atoms. The Mo-S bonds are strong, but the interaction between the s...
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http://en.wikipedia.org/wiki/Molybdenite

• (n.) A mineral occurring in soft, lead-gray, foliated masses or scales, resembling graphite; sulphide of molybdenum.
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the most important mineral source of molybdenum, molybdenum disulfide (MoS2). Molybdenite crystals have the same hexagonal symmetry as those of ... [1 related articles]
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http://www.britannica.com/eb/a-z/m/110
Mo·lyb'de·nite noun [ Confer French
molybdénite . See
Molybdena .]
(Min.) A mineral occurring in soft, lead-gray, foliated masses or scales, resembling graphite; sulphide of molybdenum.
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http://www.encyclo.co.uk/webster/M/90

Molybdenite is a grey, metallic-looking mineral with the formulae MoS2 and a relative hardness of 2. It is the main ore of molybdenum and resembles graphite but has a higher specific gravity and a slight blue tint. Molybdenite is formed by hydrothermals in sulphide ore bodies, and also in re-crystallised granitic rocks such as marble, granite and p...
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http://www.probertencyclopaedia.com/browse/HM.HTM

Molybdenum sulfide, di-
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[
n] - a mineral resembling graphite that is valued as the chief source of molybdenum and its compounds
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http://www.webdictionary.co.uk/definition.php?query=molybdenite
noun a mineral resembling graphite that is valued as the chief source of molybdenum and its compounds
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https://www.encyclo.co.uk/local/20974

Molybdenum sulphide, MoS
2, the chief ore mineral of molybdenum. It possesses a hexagonal crystal structure similar to graphite, has a blue metallic lustre, and is very soft (1–1.5 on the Mohs scale)
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https://www.encyclo.co.uk/local/21221

a soft, graphitelike mineral, molybdenum sulfide, MoS, occurring in foliated masses or scales: the principal ore of molybdenum.
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https://www.infoplease.com/dictionary/molybdenite
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