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Encyclopedia Britannica - Main :: MOL-MOS |
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MOLYBDENITE , a mineral
appearance , but may readily be distinguished from this by its greater density (4.7) and by its behaviour before the blowpipe. Crystals have the form of six-sided plates or scales, but they are never sharply defined, and their reference to the hexagonal system
mineral
paper : it is opaque and has a bright metallic lustre. The colour is lead-grey differing slightly from that of graphite in having a bluish tinge. The name molybdenite is from the Greek /2c Xu(3Sos, meaning lead or lead ore, with which graphite (black-lead) and molybdenite were confused; the latter was distinguished by P. J. Hjelm, who in 1782 discovered the element
Molybdenite occurs as disseminated scales in crystalline rockssuch as granite, gneiss, schist and marbleand also in quartz-veins. It has been found in small amounts at many localities, but only those which have yielded large crystals need be specially mentioned here, viz. in a pyroxene- rock
South
scheelite
Cumberland
Molybdenite has been used mainly for the preparation of molybdates for use as chemical reagents. Recently, however, it has been used in the manufacture of molybdenum steel (ferro-molybdenum), which by reason of its hardness and toughness is specially suitable for tools. (L. J. S.) End of Article: MOLYBDENITE If you wish, you can link directly to this article.
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