glauconite


glau·co·nite

noun \ˈgl-kə-ˌnīt\

Definition of GLAUCONITE

:  a mineral consisting of a dull green earthy iron potassium silicate occurring in greensand
glau·co·nit·ic \ˌgl-kə-ˈni-tik\ adjective

Origin of GLAUCONITE

German Glaukonit, irregular from Greek glaukos
First Known Use: 1836

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