glauconite Meaning, Definition & Usage

  1. noun a green mineral consisting of hydrated silicate of potassium or iron or magnesium or aluminum; found in greensand

WordNet

Glau"co*nite noun
Etymology
Cf. F. glauconite, glauconie, fr. L. glaucus. See Glaucous.
Definitions
  1. (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.

Webster 1913