manganostibite
/ˌmaŋɡənəʊˈstɪbʌɪt/(also manganostibiite) Mineralogy
noun
An orthorhombic oxide of manganese, antimony, and arsenic, occurring as small black grains in certain metamorphic rocks in Sweden.
Origin
Late 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From Swedish manganostibiit from mangano- + stibiit from classical Latin stibium antimony + Swedish -it.