nontronite

1 definition found

nontronite - Collaborative International Dictionary of English v.0.48 :

  Nontronite \Non"tro*nite\, n. [So called because found in the
     arrondissement of Nontron, France.] (Min.)
     A greenish yellow or green mineral, consisting chiefly of the
     hydrous silicate of iron.
     [1913 Webster]