Formula :
Na2KBaCaMn82+(Ti,Nb)4[Si8O32(OH,F)7]
System: monoclinic Hardness:4 Rarity:extremely rare
Strunz id:VIII/D.3-20 -
SILICATES
Name origin: Named after Professor Guy Perrault (1927-2002) of the École Polytechnique, Université de Montréal, Canada. Perrault was an early investigator of Mont Saint-Hilaire mineralogy and described lemoynite, yofortierite and steacyite.
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