Hydrated phosphate containing hydroxyl
Specific gravity: 2.1 (calculated)
Colour: Colourless in transmitted light
Solubility: Soluble in mineral acids
At the type Locality, the Moculta Phosphate Quarry, Angaston, Mount Lofty Ranges, South Australia, aldermanite is a
secondary mineral in cavities in a brecciated metamorphosed
sedimentary phosphate deposit,
formed by the alteration of fluellite (HOM, Mindat, AM 66.1099).
Associated minerals include
rockbridgeite, variscite and
wavellite (Dana, Mindat). Aldermanite is one of the last phosphate minerals
to form, and
is occasionally replaced by crandallite (AJM 17.1.11).
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