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Formula: Mn2+3(PO4)2.3H2O
Hydrated normal phosphate, phosphoferrite group, forms a
series with phosphoferrite,
manganese-bearing mineral
Crystal System: Orthorhombic
Specific gravity: 3 to 3.2 measured, 3.24 calculated
Hardness: 3½
Streak: White
Colour: Colourless, pale pink or yellow, reddish brown to dark brown (altered); colourless, faintly tinted pink in
transmitted light
Solubility: Soluble in acids
Common impurities: Fe
Environments
Reddingite is a rare secondary hydrothermal alteration product in
zoned complex
granite pegmatites, associated with
dickinsonite, triploidite,
triplite, lithiophilite,
fairfieldite, eosphorite,
hureaulite and rhodochrosite
(HOM).
At the type locality, the Fillow Quarry, Branchville, Redding, Fairfield County, Connecticut, USA, reddingite is
an alteration product of
lithiophilite-triphylite
(Dana).
At the Emmons pegmatite, Greenwood, Oxford county, Maine, USA, reddingite may be covered by a crust of
landesite
(R&M 94.6.514).
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