triplite
noun
trip·lite
ˈtriˌplīt
plural -s
: a dark brown monoclinic basic phosphate of manganese, iron, magnesium, and calcium (Mn,Fe,Mg,Ca)2(PO4)(F,OH) generally with a fibrous massive structure
Word History
Etymology
German triplit, from tripl- + -it -ite; from its threefold cleavage