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Formula: BaMn2+2Al2(PO4)3(OH)3
Anhydrous phosphate, bjarebyite group,
manganese-bearing mineral
Crystal System: Monoclinic
Specific gravity: 3.90 to 3.95 measured, 3.97 calculated
Hardness: 4
Streak: White
Colour: Emerald green
Environments
Bjarebyite is a late-stage reaction product of triphylite and
amblygonite in complex granite pegmatites
(HOM, Webmin).
Localities
At the Buranga pegmatite, Gatumba, Ngororero, Western Province, Rwanda, bjarebyite is associated with
bertossaite,
lazulite-scorzalite,
burangaite, trolleite,
apatite and quartz
(HOM, Webmin).
At the type locality, the Palermo No. 1 Mine, Groton, Grafton county, New Hampshire, USA, bjarebyite occurs
as rare crystals
in open cavities along the contact between
amblygonite-scorzalite
remnants and iron - manganese
oxides. Associated minerals include
amblygonite, augelite,
childrenite, siderite,
scorzalite, quartz,
montebrasite,
whitlockite and
palermoite
(AM 59.873, HOM).
Bjarebyite from the Palermo No 1 Mine - Image
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