Vivianite

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Vivianite \Viv"i*an*ite\, n. [So called by Werner after the
     English mineralogist F. G. Vivian.] (Min.)
     A hydrous phosphate of iron of a blue to green color, growing
     darker on exposure. It occurs in monoclinic crystals, also
     fibrous, massive, and earthy.
     [1913 Webster]