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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.