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 ?
Several products of the oxidation of stibnite and jamesonite have been found as earthy aggregates.
Crystals filled by fine jamesonite needles have also been found.
See Jocullani, San Luis 1 Bolivar 1 Aikinite, ankerite, benjaminite, berryite, bismuthinite, chalcopyrite, krupskaite, (*) payonite, pyrite, siderite Bolivar 2 See Antequera, El Salvador Bolivia Jamesonite Bolsa Negra Ferberite, scheelite, aka Nevada wolframite Cacachaca Chalcostibite.
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.
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.
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.
3) Sulfosalt stage: alabandite, marcasite, pyrite, arsenopyrite, quartz, manganaxinite, clinozoisite, stibnite, robinsonite, jamesonite, barite, orpiment, realgar, hutchinsonite, geocronite, native arsenic, seligmannite, Pb-As-S glass ("revoredite," not a true mineral).
Other fabulous specimens include Arizona petrified wood, dioptase from Africa, native gold specimens from Idaho Falls, Colorado, long acicular crystals of millerite [with] arsenopyrite from Mexico, and jamesonites from Mexico.