WordNet (3.0) WordNet (3.0)
(n) a green mineral consisting of hydrated silicate of potassium or iron or magnesium or aluminum; found in greensand
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
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 ]
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