manganotantalite
/ˌmaŋɡ(ə)nəʊˈtantəlʌɪt/Mineralogy
noun
A brownish variety of tantalite in which the iron is largely or wholly replaced by manganese.
Origin
Late 19th century; earliest use found in Edward Dana (1849–1935), mineralogist and physicist. From German Manganotantalit from Mangano- + Tantalit.