WordReference Random House Unabridged Dictionary of American English © 2026
cole•man•ite
(kōl′mə nīt′),USA pronunciation n.
- Mineralogya mineral, hydrous calcium borate, Ca2B6O11·5H2O, occurring in colorless or milky-white crystals.
- see -ite1 named in 1884 after west, western. T. Coleman of San Francisco, in whose mine it was found