Hinsdalite

phosphate

plumbogummite

Formula: PbAl3(SO4)(PO4)(OH)6
Compound phosphate containing hydroxyl, beudantite group, forms a series with corkite and a complete solid solution series with plumbogummite.
Specific gravity: 3.65
Hardness: 4½
Streak: White
Colour: Colourless, greenish, pearly white
Solubility: Virtually insoluble in acids. Decomposed by fusion in sodium carbonate (Mindat)
Environments:

Hydrothermal environments

Hinsdalite is an uncommon secondary mineral occurring in the oxidised zones of polymetallic sulphide deposits (Mindat, Webmin).

At Llallagua, Bustillo Province, Potosi, Bolivia, hinsdalite has been found associated with franckeite and pyrite (MinRec 37.2.140).

At the type locality, the Golden Fleece Mine, Lake City, Hinsdale county, Colorado, USA, hinsdalite occurs in a vein cutting volcanic rocks (Mindat), associated with baryte, pyrite, galena, tetrahedrite and rhodochrosite (HOM, Mindat).

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