glauconite

Pronunciation:		'gloku`nIt
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WordNet Dictionary

	Definition:	[n] a green mineral consisting of hydrated silicate of potassium or iron or magnesium or aluminum; found in greensand

	See Also:	mineral

Webster's 1913 Dictionary

	Definition:	\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}.