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Answer for the clue "A mineral resembling graphite that is valued as the chief source of molybdenum and its compounds ", 11 letters:
molybdenite

Word definitions for molybdenite in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context mineralogy English) A mineral, molybdenum disulfide molybdenumsulfur 2 , that is the principal ore of molybdenum; it is structurally similar to graphite and has a similar look and feel.

WordNet Word definitions in WordNet
n. a mineral resembling graphite that is valued as the chief source of molybdenum and its compounds

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Molybdenite \Mo*lyb"de*nite\, n. [Cf. F. molybd['e]nite. See Molybdena .] (Min.) A mineral occurring in soft, lead-gray, foliated masses or scales, resembling graphite; sulphide of molybdenum.

Wikipedia Word definitions in Wikipedia
Molybdenite is a mineral of molybdenum disulfide , Mo S . 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 ...

Usage examples of molybdenite.

With horror, Nog watched his prize drop onto the hard molybdenite floor.