Formula: (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3
Origin of name: for Peter John Wyllie (1930-), Professor of Petrology and Geochemistry, University of Chicago, Chicago, Illinois, USA.
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 to oily green, grayish green to greenish black
Diaphaneity: Translucent to transparent in thin fragments
Luster: vitreous to submetallic
Habit: crystals subhedral to euhedral, faces uneven
Hardness: 4.5
Specific gravity: 3.601
Cleavage: 2; {010} perfect, {-101} distinct
Tenacity: Brittle
Streak: dirty olive-green
Synonyms/varieties:
Comments: series with ferrowyllieite and rosemaryite
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