glau·​co·​nite ˈglȯ-kə-ˌnīt How to pronounce glauconite (audio)
: a mineral consisting of a dull green earthy iron potassium silicate occurring in greensand
glauconitic adjective

Examples of glauconite in a Sentence

Recent Examples on the Web The greenish material is glauconite … an authigenic mineral that typically forms in marine shelf settings, thought to reflect very slow sedimentation rates. Brian Romans, WIRED, 20 Mar. 2008

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'glauconite.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


German Glaukonit, irregular from Greek glaukos

First Known Use

1836, in the meaning defined above

Time Traveler
The first known use of glauconite was in 1836

Dictionary Entries Near glauconite

Cite this Entry

“Glauconite.” Dictionary, Merriam-Webster, Accessed 3 Mar. 2024.

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