d(y)üˈfrāˌnīt noun
( -s )
Etymology: French dufrénite, from O.P.A. Petit- Dufrénoy died 1857 French mineralogist + French -ite
: a blackish green mineral Fe 5 (PO 4 ) 3 (OH) 5 .2H 2 O consisting of hydrous iron phosphate commonly massive or in nodules