Formula :
(K,Na)2.5(Ca,Na)7Si16O38(OH,F)2 · 3.5H2O
System: triclinic Hardness:- Rarity:rare
Strunz id:VIII/H.15-20 -
SILICATES
Name origin: Named in 1968 by A. A. Kukharenko, M. P. Orlova, and A. G. Bulakh in honor of mathematician, crystallographer, and mineralogist Evgraf Stepanovich Fedorov [December 22, 1853 Orenberg, Russia - May 21, 1919 St. Petersburg, Russia]. Fedorov was very interested in group theory and proved important concepts involved in polytypism and wallpaper theory later used in solving crystal structures.
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