fersmanite
noun
fers·man·ite
variants or less commonly fersmannite
ˈfərzməˌnīt,
-rsm-
plural -s
: a mineral (Na,Ca)2(Ti,Cb)Si(O,F)6 consisting of a silicate fluoride of sodium, calcium, titanium, and columbium
Word History
Etymology
Russian fersmanit, from Aleksandr E. Fersman †1945 Russian mineralogist + Russian -it -ite