[ kohl-muh-nahyt ]
/ ˈkoʊl məˌnaɪt /


a mineral, hydrous calcium borate, Ca2B6O11⋅5H2O, occurring in colorless or milky-white crystals.

Origin of colemanite

named in 1884 after W. T. Coleman of San Francisco, in whose mine it was found; see -ite1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for colemanite

British Dictionary definitions for colemanite


/ (ˈkəʊlməˌnaɪt) /


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: Ca 2 B 6 O 11 .5H 2 O

Word Origin for colemanite

C19: named after William T. Coleman (1824–93), American pioneer, owner of the mine in which it was discovered
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012