from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A mineral form of molybdenum sulfide, MoS2, that is the principal ore of molybdenum.
from The Century Dictionary.
- noun Sulphid of molybdenum, occurring in foliated masses or in scales, less often in hexagonal crystals, of a lead-gray color and metallic luster. It is very soft, and, like graphite, which it closely resembles, leaves a trace on paper.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Min.) A mineral occurring in soft, lead-gray, foliated masses or scales, resembling graphite; sulphide of molybdenum.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A
mineral, molybdenum disulfide Mo S2, that is the principal oreof molybdenum; it is structurally similar to graphiteand has a similar look and feel.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a mineral resembling graphite that is valued as the chief source of molybdenum and its compounds
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
Closeups of cobaltite, top, a rare ore of cobalt, and molybdenite, bottom, the main ore of molybdenum.
Geologically, molybdenite forms in high-temperature environments such as in igneous rocks.
The most important ore source of molybdenum is the mineral molybdenite.
In 1778, Swedish chemist Carl William Scheele was studying, what he thought was lead, in the mineral molybdenite.
Some molybdenite forms when igneous bodies contact rock and metamorphose, or change, the rock.
Specifically, it is obtained from the processing of the mineral molybdenite (a molybdenum ore) that is found in porphyry copper deposits.
Molybdenum was extracted from the granite in Baltschieder during the second world war, from a unique occurrence where molybdenum is present in granite as molybdenite.
Molybdenum was discovered by the Swedish scientist, Peter Hjelm in 1781, three years after Carl Scheele proposed that a previously unknown element could be found in the mineral molybdenite.
Rhenium does not form minerals of its own, but it does occur as a trace element in columbite, tantalite and molybdenite.
The United States produces significant quantities of molybdenite from mines in Colorado, New Mexico, and Idaho.