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Formula: Mn2+2(PO4)(OH)
Anhydrous phosphate containing hydroxyl, triplite group, forms a series with
wolfeite, manganese-bearing
mineral
Crystal System: Monoclinic
Specific gravity: 3.70 measured, 3.80 calculated, 3.66 estimated value for pure Mn2+ end-member
Hardness: 4½ to 5
Streak: White, off-white
Colour: Red-brown, light pink, yellow-brown; light pink to light brown in transmitted light
Solubility: Soluble in acids
Environments
Triploidite is an uncommon hydrothermal alteration product of primary
phosphates in complex zoned granite pegmatites
(Webmin, HOM ).
Associated minerals include triplite, lithiophilite,
triphylite, eosphorite,
dickinsonite and rhodochrosite
(HOM).
Localities
At Wien, Moravia, Czech Republic, triploidite occurs as an alteration of triplite
(Dana).
At the type locality, the Fillow Quarry, Branchville, Redding, Fairfield County, Connecticut, USA, triploidite occurs in a
granite pegmatite associated with
rhodochrosite, lithiophilite,
eosphorite and dickinsonite-(KMnNa)
(Mindat, Dana).
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