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Formula: CaAl2(PO4)2(OH)2.H2O
Hydrated phosphate containing hydroxyl
Crystal System: Monoclinic
Specific gravity: 2.92 measured, 2.95 calculated
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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