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Formula: Pb0.5Fe3+3(SO4)2(OH)6
Anhydrous sulphate containing hydroxyl, alunite group
Forms solid solution series with jarosite, natrojarosite,
beudantite, corkite and
beaverite-(Cu)
(Mindat).
Crystal System: Trigonal
Specific gravity: 3.665 measured, 3.71 calculated
Hardness: 1½ to 2
Streak: Pale yellow
Colour: Golden-brown to dark-brown, dark brown-red, blackish
Solubility: Very slowly soluble in acids (Mindat).
Environments:
Plumbojarosite is a secondary mineral occurring in the oxidised zone of
lead-bearing ore deposits, (Webmin) formed by the
reaction between galena and oxidising pyrite,
typically in arid regions, associated with jarosite,
anglesite and limonite
(HOM).
At Tsumeb, Namibia, plumbojarosite has been found associated with fleischerite.
(R&M 93.6.547).
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