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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:
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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