Formula: (Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3
Origin of name: From ferrous iron (Fe2+) and wyllieite
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 11.868, b = 12.382, c = 6.354, β = 114.52°
Colour: Deep bluish green, gray green to green black
Diaphaneity: Transparent to translucent
Luster: Vitreous to submetallic
Habit: Crystals mostly crude, masses, euhedral, as reaction rims surrounding host minerals
Hardness: 4
Specific gravity: 3.60
Cleavage: 2; {010} perfect, {-101} distinct
Tenacity: Brittle
Streak: Gray green
Synonyms/varieties:
Comments: Series with wyllieite and with rosemaryite
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