Hinsdalite

hinsdalite

tetrahedrite

beudantite

plumbogummite

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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.
Crystal System: Trigonal
Specific gravity: 3.65 measured, 4.07 calculated
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 Monte Falò, Coiromonte, Armeno, Novara Province, Piedmont, Italy, colourless to pale yellow crystals of albertiniite occur associated with stolzite, pyromorphite, hinsdalite, plumbogummite, gibbsite, scheelite and jarosite on brittle fractures of quartz veins or chlorite schist (MM 80.6.985–994).

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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