A greenish mineral of the mica group, a hydrous silicate of potassium, iron, aluminum, or magnesium, (K,Na)(Al,Fe,Mg)2 (Al,Si)4 O10 (OH)2 , found in greensand and used as a fertilizer and water softener.
A greenish silicate of iron and potassium, a kind of mica found in greensand.
German Glaukonit Greek glaukonneuter ofglaukosgray–ite
American Heritage Dictionary of the English Language, 5th Edition
Glauconite Sentence Examples
Green mud differs to a greater extent from the blue mud, and owes its characteristic nature and colour to the presence of glauconite, which is formed inside the cases of foraminifera, the spines of echini and the spicules of sponges in a manner not yet understood.
Secondary products, such as glauconite, phosphatic concretions and manganese nodules, occur though less frequently than in the hemipelagic sediments.
The most distinctive feature of the Cretaceous of the Atlantic coastal plain is its large content of greensand marl (glauconite).
Minerals, like glauconite, which contain ferrous silicate, may in like manner yield limonite, on weathering.
Dark " green-sands," very rich in glauconite, are followed by yellow sandstones with some flint.