The Collaborative International Dictionary
Flos-ferri
Flos-ferri \Flos`-fer"ri\, n.[L., flower of iron.] (Min.) A variety of aragonite, occuring in delicate white coralloidal forms; -- common in beds of iron ore.
Wiktionary
flos-ferri
n. (context mineral English) A variety of aragonite occurring in delicate white coralloidal forms, common in beds of iron ore.