mendelyeevite

\\ˌmendəlˈyā(y)əˌvīt, -dəˈlā-\ noun (-s)

Etymology: Dmitri I. Mendeleev (Mendelyeev) died 1907 Russ. chemist + English -ite

: a calcium urano-titano-niobate occurring in black isometric crystals and masses and being essentially a titanian and rare-earth-bearing betafite