fillowite
noun
fil·low·ite
ˈfiləˌwīt
plural -s
: a mineral H2Na6(Mn,Fe,Ca)14(PO4)12.H2O(?) consisting of a brown, yellow, or colorless hydrous phosphate of manganese, iron, sodium, and other metals
Word History
Etymology
A. N. Fillow, 19th century American mine owner + English -ite