Glauconite

Glauconite, also known as `green sand` is an iron potassium phyllosilicate (mica group) mineral of characteristic green color with very low weathering resistance and very friable. It crystallizes with a monoclinic geometry. Its name is derived from the Greek glaucos (γλαυκος) meaning `blue`, referring to the common blue-green color of t...
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Glauconite

• (n.) 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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Glauconite

Glau'co·nite noun [ Confer French glauconite , glauconie , from Latin 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 .
Found on http://www.encyclo.co.uk/webster/G/31

glauconite

glauconite A greenish mineral of the mica group, a hydrous silicate of potassium, iron, aluminum, or magnesium, found in greensand and used as a fertilizer and water softener. Greensand is a variety of sandstone, usually imperfectly consolidated, consisting largely of glauconite, a silicate of iron and potash of a green color, mixed with sand and ...
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Glauconite

Glauconite is a mineral of marine origin and found in sedimentary deposits of various kinds. It is the green mineral characteristic of the greensand of the chalk and other formations. It is similar to a mineral called celadonite, it is used in the textile, sugar, and brewing industries; as a colouring agent and in the manufacture of fertilizers. It...
Found on http://www.probertencyclopaedia.com/browse/HG.HTM

glauconite

greenish ferric-iron silicate mineral with micaceous structure [(K, Na)(Fe3+,Al, Mg)2(Si, Al)4O10(H)2], characteristically formed on submarine ... [3 related articles]
Found on http://www.britannica.com/eb/a-z/g/37

glauconite

[n] - a green mineral consisting of hydrated silicate of potassium or iron or magnesium or aluminum
Found on http://www.webdictionary.co.uk/definition.php?query=glauconite
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