Gatumbaite

gatumbaite

trolleite

scorzalite

bjarebyite

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Formula: CaAl2(PO4)2(OH)2.H2O
Hydrated phosphate containing hydroxyl
Specific gravity: 2.92
Hardness: 4 to 5
Streak: White
Colour: White
Solubility: Dissolves slowly in dilute and hot mineral acids (AM 63.793-794)
Environments

Igneous environments
Pegmatites

Localities

At Mount Perry, North Burnett Region, Queensland, Australia, gatumbaite occurs in altered andesite associated with trolleite, augelite, andalusite, rutile, topaz and quartz (HOM).

At the type locality, the Buranga pegmatite, Gatumba, Ngororero, Western Province, Rwanda, gatumbaite occurs in a complex granite pegmatite associated with trolleite, scorzalite, apatite, bjarebyite and burangaite (AM 63.793-794, HOM, Mindat).

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