Anhydrous phosphate containing hydroxyl, triplite group, forms a series with wolfeite
Specific gravity: 3.70
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
Triploidite is an uncommon hydrothermal alteration product of primary
phosphates in complex zoned granite pegmatites
(Webmin, HOM ).
Associated minerals include triplite, lithiophilite,
dickinsonite and rhodochrosite
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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