manganhedenbergite
/ˌmaŋɡ(ə)nˈhɛd(ə)nbəːɡʌɪt/Mineralogy
noun
A variety of hedenbergite containing 6.5 per cent manganese oxide.
Origin
Late 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From Swedish manganhedenbergit from mangan + hedenbergit.