ˈfiləˌwīt noun
( -s )
Etymology: A. N. Fillow, 19th century American mine owner + English -ite
: a mineral H 2 Na 6 (Mn,Fe,Ca) 14 (PO 4 ) 12 .H 2 O(?) consisting of a brown, yellow, or colorless hydrous phosphate of manganese, iron, sodium, and other metals