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Formula: [Mg(H2O)6][Na(H2O)2Al3(PO4)2F6].H2O
Hydrated phosphate
Crystal System: Monoclinic
Specific gravity: 2.12 calculated
Colour: Colourless, white
Environments
Penriceite is a new mineral, approved in 2021.
Localities
At the type locality, the Penrice marble quarry, Penrice, Barossa Valley, North Mt Lofty Ranges, South Australia,
phosphate-rich areas in a gossanous zone consisting of
limonitic and manganiferous
clay-rich rocks were located within the
marble. Penriceite occurs as rod-like aggregates up to about
100 microns across. Associated minerals include angastonite,
minyulite, perhamite,
crandallite and fluorapatite.
Penriceite crystallised from groundwaters at ambient temperatures and the phosphorus derived by leaching of
weakly phosphatic limestones or low-grade
primary
phosphorites
(AJM 23.1.5-12).
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