Glauconite
Pronunciation : Glau"co*nite
Part of Speech : n.
Etymology : [Cf. F. glauconite, glauconie, fr. L. glaucus. See Glaucous.] (Min.)
Definition : Defn: The green mineral characteristic of the greensand of the chalk and other formations. It is a hydrous silicate of iron and potash. See Greensand.
Source : Webster's Unabridged Dictionary, 1913