a soft, graphitelike mineral, molybdenum sulfide, MoS 2 , occurring in foliated masses or scales: the principal ore of molybdenum.

1790–1800; obsolete molybden(a) molybdenum + -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
molybdenite (mɒˈlɪbdɪˌnaɪt)
a soft grey mineral consisting of molybdenum sulphide in hexagonal crystalline form with rhenium as an impurity: the main source of molybdenum and rhenium. Formula: MoS2

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
molybdenite   (mə-lĭb'də-nīt')  Pronunciation Key 
A soft, lead-gray hexagonal mineral that is the principal ore of molybdenum. It occurs as sheetlike masses in pegmatites and in areas where contact metamorphism has taken place. Chemical formula: MoS2.
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Encyclopedia Britannica


the most important mineral source of molybdenum, molybdenum disulfide (MoS2). Molybdenite crystals have the same hexagonal symmetry as those of tungstenite (tungsten disulfide). Both have layered structures and similar physical properties; the chief difference is the higher specific gravity of tungstenite. For detailed physical properties, see sulfide mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Molybdenite could also offer advantages for making higher-performance flexible
  solar cells and light-emitting diodes for displays.
Molybdenite is the crystalline sulfide of molybdenum and the principal mineral
  from which molybdenum metal is extracted.
They also found the element in gadolinite and molybdenite.
Almost all molybdenum is gotten from low grade deposits of another mineral
  called molybdenite.
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