Anhydrous phosphate containing hydroxyl, manganese-bearing mineral, bjarebyite group
Specific gravity: 4.02
Colour: Emerald green
Bjarebyite is a late-stage reaction product of triphylite and
amblygonite in complex granite pegmatites
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).
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