Hydrated normal phosphate, phosphoferrite group and forms a series with it
Specific gravity: 3 to 3.2
Colour: Colourless, pale pink or yellow, reddish brown to dark brown (altered); colourless, faintly tinted pink in transmitted light
Solubility: Soluble in acids
Reddingite is a rare secondary hydrothermal alteration product in
granite pegmatites, associated with
hureaulite and rhodochrosite
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).
Common impurities: Fe
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