colemanite definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a white or colorless, monoclinic mineral, CaBO·5HO, that is an ore of boron; hydrous calcium borate
Origin: after W. T. Coleman (1824-93), United States manufacturer of borax
colemanite definition by American Heritage Dictionary
A natural white or colorless hydrated calcium borate, Ca2B6O11·5H2O, a principal source of borax.
Origin: After William Tell Coleman (1824-1893), American merchant in California.