ˌfäsfō+ noun
Etymology: phosph- + phyllite
: a mineral Zn 2 (FeMn)PO 4 ) 2 .4H 2 O consisting of a hydrous phosphate of zinc, ferrous iron, and manganese and forming colorless or pale blue monoclinic crystals with perfect micaceous cleavage (hardness 3-4, specific gravity 3.1)