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Formula: Mn2+Al2(PO4)2(OH)2.8H2O
Hydrated phosphate containing hydroxyl, laueite group,
paramorph of kastningite,
manganese-bearing mineral
Crystal System: Triclinic
Specific gravity: 2.36 measured, 2.35 calculated
Hardness: 3
Streak: White
Colour: Colourless, white, light yellow
Environments
Mangangordonite occurs as a very rare secondary mineral
in complex zoned granite
pegmatites (Webmin).
Localities
There are two co-type localities, the Dunton Gem Quarry, Newry, Oxford county, Maine, USA, and the Foote Lithium Co.
mine, Kings Mountain Mining District, Cleveland county, North Carolina, USA.
At the Dunton Gem Quarry, Newry, Oxford county, Maine, USA, mangangordonite occurs as bladed crystals and divergent
aggegates up to 1 mm long in vugs in pegmatite
(AM 76.2022-2023). Associated minerals include tourmaline,
siderite, muscovite and
quartz
(HOM}.
At the Foote Lithium Co. mine, Kings Mountain Mining District, Cleveland county, North Carolina, USA,
mangangordonite occurs as nearly equant to bladed crystals up to 2 mm in vugs in
spodumene-microcline-quartz
pegmatite (AM 76.2022-2023). Associated minerals include
jahnsite, beraunite,
strunzite, strengite,
spodumene, quartz,
muscovite and fluorapatite
(HOM}.
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