Hypertext Webster Gateway: "glauconite"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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}.
From WordNet (r) 1.7 (wn)
glauconite
n : a green mineral consisting of hydrated silicate of potassium
or iron or magnesium or aluminum; found in greensand
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