manganocolumbite
/ˌmaŋɡ(ə)nəʊkəˈlʌmbʌɪt/Mineralogy
noun
A greenish variety of columbite 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 mangano- + columbite.