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Formula: AgFe3+3(SO4)2(OH)6
Anhydrous sulphate containing hydroxyl, alunite group
Crystal System: Trigonal
Specific gravity: 3.66 measured, 3.81 calculated
Hardness: 3½ to 4½
Streak: Yellowish
Colour: Yellow-brown to brown
Environments:
Argentojarosite is a secondary
silver mineral derived from the oxidation of
sulphide and silver-bearing sulphide minerals
(Webmin, HOM).
Localities
At the Manila Mine, Cochise County, Arizona, USA, argentojarosite occurs as a brown crust of crudely rounded
octahedral crystals and is associated with jarosite and native
gold on iron-stained quartz from the
mine dump
(R&M 90-4.341).
At the type locality, the Tintic Standard Mine, East Tintic Mountains, Utah county, Utah, USA, argentojarosite
occurs as yellow-brown, scaly, pseudo-hexagonal crystals embedded in and emplaced upon
quartz, associated with anglesite
and baryte
(MinRec 55.2.177)
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