norbergite
noun
nor·berg·ite
ˈnȯrˌbərˌgīt
plural -s
: a mineral Mg3SiO4(F,OH)2 of the humite group composed of a magnesium silicate with fluorine and hydroxyl
Word History
Etymology
Swedish norbergit, from Norberg, Västmanland, Sweden, its locality + Swedish -it -ite