dufrenite
noun
du·fre·nite
d(y)üˈfrāˌnīt
plural -s
: a blackish green mineral Fe5(PO4)3(OH)5.2H2O consisting of hydrous iron phosphate commonly massive or in nodules
Word History
Etymology
French dufrénite, from O.P.A. Petit-Dufrénoy †1857 French mineralogist + French -ite