Wulfenite


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wulfenite

[′wu̇l·fə‚nīt]
(mineralogy)
PbMoO4 A yellow, orange, orange-yellow, or orange-red tetragonal mineral occurring in tabular crystals or granular masses; an ore of molybdenum. Also known as yellow lead ore.

Wulfenite

 

(named for the Austrian mineralogist F. Wulfen, 1728-1805), a mineral with the chemical composition Pb[MoO4]; contains 38.6 percent MoO3. It forms small platelike crystals of a tetragonal system, colorless or orange, with a diamondlike luster on the fracture. Reddish brown granular aggregates and powderlike masses also occur. Hardness on the mineralogical scale, 3.0-3.5; density, 6,500-7,000 kg/m3. Wulfenite is formed in the zone of surface oxidation of deposits of lead ores containing mixtures of molybdenum sulfides. It is usually found together with brown hydrous ferric oxides, pyromorphite, vanadinite, and other minerals. It is used as an ore for the smelting of lead and, less frequently, molybdenum.

G. P. BARSANOV

References in periodicals archive ?
There was also malachite in dark green, ropy flows and hemispheres coating cabinet-size pieces of matrix; fine examples of the now familiar Ojuela wulfenite and aurichalcite-included calcite; Milpillas mine azurite; 10-cm subparallel crests of white barite crystals on drusy amethyst (the first good barite from the amethyst fields of Las Vigas, Veracruz); spectacular Navidad mine, Durango creedite and Cerro de Mercado, Durango fluorapatite specimens .
Excellent thumbnails and small miniatures of Scott Kleine's new wulfenite from the Mobile mine, Nevada, ran between $75 and $150.
They occur in an early assemblage and are usually associated with brochantite, perite and other bismuth minerals, plattnerite and minute wulfenite crystals, which they commonly overgrow.
China was pretty quiet this time around--although I must not neglect to mention that Evan Jones and Marcus Origlieri had many spectacular cabinet-size plates of red-orange wulfenite crystals, newly brought in from the still mysterious mine in the Kuruktag Mountains, Xinjiang Uygur Autonomous Region, noted in an article in our "China II" issue (January-February 2007).
fr) shared a Holiday Inn room with Pala International, and scattered amidst other good stuff on Alain's segments of glass shelving were about 12 fine thumbnails and miniatures of cerussite from the old M'Fouati mine, Mindouli region, Republic of the Congo (formerly French Congo), a locality known best for its large quartz-coated wulfenite crystals.
Since 1952 the site has stood abandoned, visited only (and that very infrequently) by mineral collectors searching for vanadinite and wulfenite crystal specimens.
The most outstanding of these non-Mexican specimens included California gold, Tsumeb wulfenite, New Mexico linarite (perhaps the world's best, from the Blanchard claim), and Arizona azurite.
Attractive specimens of bright red to brown vanadinite from the Apex mine began appearing on the specimen market in the 1950s, and a few very fine red-orange wulfenite specimens were collected there in the early 1970s.
Wulfenite specimens from the Red Cloud mine in the Silver District of La Paz County, Arizona are widely regarded as the world's most desirable examples of the species.
First, the Ojuela mine, Mapimi, Durango--for a general history and complete mineralogy see our Mexico II issue (September-October 2003)--has now outdone itself in two secondary lead species, wulfenite and cerussite.
Tiger was not a producing locality back then, but one wulfenite from "Schulz, Arizona" was noted.
Bill often collected far afield--traveling to Mexico for wulfenite at Los Lamentos and boleite at Santa Rosalia; to Spain for the famous pyrites; to Prince of Wales Island, Alaska for epidote; to the Yukon Territory for lazulite; to almost all the localities in California, Nevada, Arizona and Utah.