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Formula: ☐NaFe2+(Fe3+Al)(PO4)3
Phosphate, wyllieite group,
alluaudite supergroup
Crystal System: Monoclinic
Specific gravity: 3.62 calculated
Hardness: 4
Streak: Greenish to brownish
Colour: Dark green to bronze
Luminescence: Not fluorescent under UV
Ferrorosemaryite was approved in 2003 and to date (October 2023) it has been reported only from
the type locality.
Localities
At the type locality, the Rubindi pegmatite, Bwira, Ngororero District, Western Province, Rwanda,
ferrorosemaryite occurs as large idiomorphic grains reaching 3 mm in size, embedded in
scorzalite. Associated phosphate minerals are
scorzalite, trolleite,
montebrasite, bertossaite,
and brazilianite, with accessory
augelite, triplite and
lacroixite
(EJM 17.5.749-759).
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