Meaning of vivianite

viv•i•an•ite

Pronunciation: (viv'ē-u-nīt"), [key]
— n.
  1. a secondary mineral, hydrous ferrous phosphate, Fe(PO)&multiplydot;8HO, occurring in the form of pale blue crystals or powder.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.