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Formula: Pb4FeSb6S14
Sulphosalt, forms a series with benavidesite
Crystal System: Monoclinic
Specific gravity: 5.63 measured, 5.76 calculated
Hardness: 2½
Streak: Black, greyish
Colour: Grey-black; iridescent at times
Common impurities: Cu,Zn,Ag,Bi
Environments:
Jamesonite is typically a late stage hydrothermal mineral in lead -
silver - zinc veins formed at low to
moderate temperatures
(Webmin),
associated with other lead sulphosalts,
pyrite, sphalerite,
galena, tetrahedrite,
stibnite, quartz,
siderite, calcite,
dolomite and rhodochrosite
(HOM).
Localities
At the Adelaide Mine, Dundas, western Tasmania, Australia, below the zone of oxidation the ore consists of
galena, sphalerite and
pyrite in a gangue of manganese-rich
siderite, dolomite and
serpentine
(AJM 12.2.66).
At Platt's Prospect, Dundas, western Tasmania, Australia, the sulphide ores consist mostly of
galena, sphalerite and jamesonite
(AJM 12.2.74).
At Llallagua, Bolivia, jamesonite is widespread in those veins that transect
sedimentary rock. It has been found as inclusions in some
fluorapatite and
vivianite crystals
(MinRec 37.2.140).
At the Dachang Sn-polymetallic ore field, Nandan County, Hechi, Guangxi, China, minerals of the
jamesonite-benavidesite series have been found
(CM 25.667-67).
At Yaogangxian, Yizhang county, Hunan, China, jamesonite has been found as inclusions in
fluorite, and also as parallel bundles on
quartz crystals
(MinRec 42.6.587, R&M 80.1.54-55).
In the Taxco Mining District, Guerrero, Mexico, jamesonite occurs covering quartz
(MinRec 42.5.430).
At Slate Creek, Custer county, Idaho, USA, jamesonite has been found on a quartz
and siderite gangue with small amounts of
pyrite and arsenopyrite
(AM10.194-197).
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