Jamesonite


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Related to Jamesonite: stibnite

jamesonite

[′jām·sə‚nīt]
(mineralogy)
Pb4FeSb6S14 A lead-gray to gray-black mineral that crystallizes in the orthorhombic system, occurs in acicular crystals with fibrous or featherlike forms, and has a metallic luster. Also known as feather ore; gray antimony.

Jamesonite

 

(named for the Scottish mineralogist R. Jameson, 1774-1854), a mineral from the sulfide group. Its chemical composition is Pb4FeSb6S14; Cu, Ag, and Zn are present as impurities. Jamesonite has a complex, chain-type structure and crystallizes in the monoclinic system. It forms filiform-acicular, capillary, felted, and granular aggregates, and, more rarely, fine acicular or fibrous lead-gray crystals with a metallic luster. Jamesonite is brittle. Its hardness on the mineralogical scale is 2-3, and its density measures 5,500-6,000 kg/m3. It is found in ores of lead-zinc hydrothermal deposits.

References in periodicals archive ?
The xenomorphic tetrahedrite and freibergite usually coexist with bournonite, boulangerite, jamesonite, chalcopyrite, and galena (Figures 4(n), 5(c), and 6).
Several products of the oxidation of stibnite and jamesonite have been found as earthy aggregates.
cassiterite, fluorite, jamesonite, marcasite, pyrite, sphalerite, stibnite Dafangshen Liaoning antigorite, chlorite, chrysotile, lizardite, talc, tremolite Dahegou Henan calcite, barite, stibiconite, stibnite Damiao Hebei *damiaoite Daoping Guangxi cerussite, galena, pyromorphite, Zhuang A.R.
Countering that colorful duo was a gray-black, metallic, exceptionally thick jamesonite, one of the best around.
Between and scattered upon the large crystals of these species are small needles of rutile, little gray rhombs of calcite, monazite and apatite microcrystals, and (oddly) tiny hairs of metallic black jamesonite. A fine miniature with either siderite or biotite, or both, can be had for around $100.
It is more than likely that the "fibrous jamesonite" mentioned from the galena of the Andrdssy II section (Koch et al., 1950) was boulangerite, as the occurrence of jamesonite has not been confirmed to date.
Jamesonite specimens from the Nikolaevskiy mine are thought to be at least in part boulangerite.
The mineral forms rare microscopic fibrous intergrowths with jamesonite and berthierite in 3mm-thick veins.
35 crandallite) (1997), 1571 Warrenite (= jamesonite) Pending Wellsite (= phillipsite Coombs et al.: Can.
Almost randomly I'll select for individual raves Kerith Graeber's red grossular from Coahuila, her 4-cm kottingite spray from the Ojuela mine, and her matrix boleite with three 1.5-cm cubes; Peter Megaw's thumbnail of aguilarite with stacked skeletal crystals, and his Guanajuato wire silver; Evan Jones' 6-cm Fresnillo pyrargyrite, his huge and brilliant and stibnite-mimicking Zacatecas jamesonite, and his unearthly-beautiful San Francisco mine wulfenite.
Massive jamesonite occurs sporadically in peripheral veins, as for example at the Lourdes mine on the south flank of Cerro Rico, where it is found with wurtzite.
Eight entries in his Catalogue of Minerals Found in Colorado are: cuprite, fluorite, jamesonite, melanterite, rhodochrosite, tetrahedrite, tennantite and zinkenite.