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Formula: (NH4)2Ca(PO3OH)2.H2O
Hydrated acid phosphate, monoclinic paramorph of orthorhombic
swaknoite
Crystal System: Monoclinic
Specific gravity: 2.05 measured, 2.09 calculated
Hardness: 1 to 2
Streak: White
Colour: Colourless
Solubility: Insoluble in water
Environments
Localities
The type locality, the Petrogale Cave, Madura Roadhouse, Dundas Shire, Western Australia, is a cave with bat guano, at 20.5°C
and 68.5% relative humidity. Mundrabillaite occurs as tiny crystals in association with
archerite, biphosphammite,
aphthitalite, halite,
syngenite, stercorite,
oxammite, weddellite,
whitlockite, guanine,
newberyite, calcite and an unknown
phosphate
(MM 47.80-81, Mindat).
At the Arnhem Cave, Windhoek Rural, Khomas Region, Namibia, mundrabillaite is associated with
swaknoite, dittmarite and
arcanite
(HOM).
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