Wyllieite
Wyllieite is an IMA-recognized mineral species in the phosphate class, with the chemical formula NaNaMn(Fe²⁺Al)(PO₄)₃.
It crystallizes in the monoclinic crystal system (space group P2_1/n). It is a member of the Alluaudite-Wyllieite structural group.
Key properties: Mohs hardness 4; specific gravity 3.61; [Vitreous to submetallic] luster; optically biaxial.
IMA symbol Wyl, IMA status: approved, named in 1972.
Found in zoned complex granite pegmatites.
It is found associated with Trolleite, scorzalite (Buranga, Rwanda).
The mineral was named to honor Dr. Peter John Wyllie (1930–), Professor of Petrology and Geochemistry, University of Chicago, Chicago, Illinois, USA.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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