manganophyllite
/ˌmaŋɡənəʊˈfɪlʌɪt/Mineralogy
noun
A variety of biotite containing manganese, occurring as thin reddish scales.
Origin
Late 19th century; earliest use found in Edward Dana (1849–1935), mineralogist and physicist. From German Manganophyll + -ite; compare -phyllite.