mendelyeevite
noun
men·de·lye·ev·ite
ˌmendəlˈyā(y)əˌvīt,
-dəˈlā-
plural -s
: a calcium urano-titano-niobate occurring in black isometric crystals and masses and being essentially a titanian and rare-earth-bearing betafite
Word History
Etymology
Dmitri I. Mendeleev (Mendelyeev) †1907 Russian chemist + English -ite