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Jamesonite

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jamesonite [′jām·sə‚nīt]
(mineralogy)
Pb4FeSb6S14A 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.
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They can be weakly mineralized in places with arsenopyrite, pyrite and rare jamesonite and boulangerite in a quartz gangue.
Great mining camps of Canada 1. The history and geology of the Keno ... by Cathro, R.J. / Geoscience Canada
Gold mineralization in the 2004 Phase 1 drill holes was in the form of fine grained and visible free gold associated with quartz veins, stockworks and quartz rich shear zones containing between 1 percent to 3 percent pyrite, arsenopyrite and jamesonite.
Alaska 2004: mining in review: exploration, development and ... by Freeman, Curtis J. / Alaska Business Monthly
Unaltered quartz veins containing jamesonite were discovered in a shear zone in Trench 1.
Teryl Resources Corp. Plans a Drill Program on the Newly-Discovered ... by Business Wire
 
 
 
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