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A natural white or colorless hydrated calcium borate, Ca2B6O11·5H2O, that is formed in conjunction with borax deposits and is a principal source of boric acid.

[After William Tell Coleman (1824-1893), American merchant in California.]


(Minerals) a colourless or white glassy mineral consisting of hydrated calcium borate in monoclinic crystalline form. It occurs with and is a source of borax. Formula: Ca2B6O11.5H2O
[C19: named after William T. Coleman (1824–93), American pioneer, owner of the mine in which it was discovered]


(ˈkoʊl məˌnaɪt)

a mineral, hydrous calcium borate, Ca2B6O11∙5H2O, occurring in colorless or milky white crystals.
[1884; after W. T. Coleman of San Francisco, in whose mine it was found]
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References in periodicals archive ?
The important boron minerals of Turkey are tincal, colemanite and ulexite.
18] investigated the dissolution of colemanite ore with acetic acid and found that higher leaching agent amount in reaction medium elated the rate of product formation with the appearance of sparingly solid film layer which results in fall in leaching reaction.
The effectiveness of crushed ore colemanite as B source for rice crop under flooded calcareous soil was evaluated in a glass house study.
Yartasi, Dissolution of colemanite in aqueous solutions saturated with both sulfur dioxide and boric acid, Ind.
Boron production is carried out at four mines and four associated processing plants which produce three different borate minerals: colemanite, ulexite and tincal.
For the lover of minerals from below sea level, Tony had colemanite crystals from the Boraxo pit, Death Valley, Inyo County, California in short-prismatic, spear-shaped crystals in radiating and upstanding groups.
Although it's fairly dark inside my head, I can see by the light of my colemanite lamp that much of the basic structure of the skull appears to be New England granite.
Within commercial products and the most important minerals that contain boron are the borax pentahydrate, sodium perborate, boric acid, colemanite and ulexite.
Commonly existing boron minerals in Turkey are tincal, colemanite and ulexite.
Nordkalk also imports, to a small extent, kaolin and colemanite.
Three facies, designated Barren (calcareous nodules), Colemanite (calcium borate) and Ulexite (calcium and sodium borate) overlie the sodium borate facies where most of the useable ore is to be found.