kalkowskite

\\kalˈkȯfˌskīt\ noun (-s)

Etymology: German kalkowskyn (irregular from E. L. Kalkowsky died 1938 German mineralogist + German -in -ine) + English -ite

: a mineral Fe₂Ti₃O₉(?) consisting of an oxide of iron and titanium and usually containing small amounts of rare-earth elements, niobium, and tantalum