glauconite

[glaw-kuh-nahyt]
noun
a greenish micaceous mineral consisting essentially of a hydrous silicate of potassium, aluminum, and iron and occurring in greensand, clays, etc.

Origin:
1830–40; < Greek glaukón, neuter of glaukós (see glauco-) + -ite1

glauconitic [glaw-kuh-nit-ik] , adjective
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glauconite (ˈɡlɔːkəˌnaɪt)
 
n
a green mineral consisting of the hydrated silicate of iron, potassium, aluminium, and magnesium: found in greensand and other similar rocks. Formula: (K,Na,Ca)0.5-1(Fe,Al,Mg)2(Si,Al)4O10(OH)2.nH2O
 
[C19: from Greek glaukon, neuter of glaukos bluish-green + -ite1; see glaucous]
 
glauconitic
 
adj

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Encyclopedia Britannica
Encyclopedia

glauconite

greenish ferric-iron silicate mineral with micaceous structure [(K, Na)(Fe3+,Al, Mg)2(Si, Al)4O10(OmicronH)2], characteristically formed on submarine elevations ranging in depth from 30 to 1,000 metres (100 to 3,300 feet) below sea level. Glauconite is abundant only in sea-floor areas that are isolated from large supplies of land-derived sediment.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Glauconite grains are typically dark green and have botryoidal shapes.
Locally, thin stringers of pale-greenish-brown, smooth-surface glauconite occur near the top.
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