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Formula: ☐NaMn(Fe3+Al)(PO4)3
Anhydrous normal phosphate, wyllieite group,
alluaudite supergroup, forms series with
wyllieite and with
ferrowyllieite
Crystal System: Monoclinic
Specific gravity: 3.63 calculated
Hardness: 4 to 4½
Streak: Greenish white
Colour: Dark olive-green, dark brown
Luminescence: Not fluorescent
Environments
Common associates include alluaudite,
montebrasite, scorzalite and
trolleite
(Mindat).
Localities
At the Buranga pegmatite, Muhororo, Ngororero District, Western Province, Rwanda, rosemaryite is associated
with trolleite, alluaudite,
montebrasite, scorzalite and
strengite
(HOM).
At the type locality, the Rock Ridge pegmatite, Custer, Custer Mining District, Custer county, South Dakota, USA,
rosemaryite occurs as dark greenish black monocrystalline masses in a zoned, complex
granite
pegmatite. Associated minerals include
triphylite and quartz
(Mindat, Webmin).
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