Anhydrous sulphate containing hydroxyl, alunite group
Specific gravity: 3.66
Hardness: 3½ to 4½
Colour: Yellow-brown to brown
Argentojarosite is a secondary silver mineral derived from the oxidation of
sulphide and silver-bearing sulphide minerals
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 is associated with quartz, baryte and anglesite (Mindat, HOM).
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