• WordNet 3.6
    • n glauconite a green mineral consisting of hydrated silicate of potassium or iron or magnesium or aluminum; found in greensand
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Webster's Revised Unabridged Dictionary
    • n Glauconite (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.
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Century Dictionary and Cyclopedia
    • n glauconite A mineral which is essentially a hydrous silicate of iron and potassium. It is the “green earth” of the cavities of eruptive rocks, or the substance which gives the color to the grains of greensand and chalk.
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Chambers's Twentieth Century Dictionary
    • n Glauconite glaw′kō-nīt the mineral, a silicate of iron, which gives a green colour to some of the beds of the greensand strata, whence their name
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Webster's Revised Unabridged Dictionary
Cf. F. glauconite, glauconie, fr. L. glaucus,. See Glaucous
Chambers's Twentieth Century Dictionary
Fr.,—Gr. glaukos, bluish-green.


In literature:

They are made of a mixture of sand and clay coloured dark green by a mineral called glauconite.
"The Geological Story of the Isle of Wight" by J. Cecil Hughes
The Aptian rocks are generally clays, marls and green glauconitic sands with occasional limestones.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3" by Various
The beds in this series vary a good deal lithologically, some being sandy, others marly or glauconitic; fossils are abundant.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 6" by Various
The glauconitic grains of the Greensand formations are chiefly foraminiferal casts.
"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6" by Various
The colouring matter is believed in every case to be glauconite.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 1" by Various
They appear in some cases to be altered limestones and in others altered glauconitic sandstones.
"Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 6" by Various