Found 2 items, similar to glauconite.
English → English (WordNet) Definition: glauconite glauconite n : a green mineral consisting of hydrated silicate of potassium or iron or magnesium or aluminum; found in greensand
English → English (gcide) Definition: Glauconite Glauconite \Glau"co*nite\, n. [Cf. F. glauconite, glauconie, fr. L. glaucus. See Glaucous.] (Min.) The green mineral characteristic of the greensand of the chalk and other formations. It is a hydrous silicate of iron and potash. See Greensand. [1913 Webster]