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Formula: Ca4Fe2+Al4(PO4)6(OH)4.12H2O
Hydrated phosphate containing hydroxyl, montgomeryite group
Crystal System: Triclinic
Specific gravity: 2.51 measured, 2.58 calculated
Hardness: 2½
Streak: White
Colour: Colourless to white, may have a light tan to pale brown tinge
Environments
Pegmatites
Hydrothermal environments
Kingsmountite is a secondary mineral formed by the oxidation of
primary phosphates by descending oxidising ground water in complex
granite pegmatites
(Webmin, HOM).
Localities
At Vasin-Myl'k Mt, Voron'i Tundry, Murmansk Oblast, Russia, kingsmountite is associated with
eosphorite,
laueite, lun'okite,
fairfieldite and mitridatite
(HOM).
At the type locality, the Foote Lithium Company Mine, Kings Mountain Mining District, Cleveland county, North Carolina, USA, kingsmountite
occurs in phosphate mineralised fractures in granite pegmatite, associated with
mitridatite, mangangordonite,
birnessite and albite
(Mindat, Dana, HOM).
At the Tip Top mine, South Dakota, USA, kingsmountite is associated with whitlockite and
cyrilovite
(HOM).
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