Definition of colemanite in English:

Share this entry


Pronunciation: /ˈkəʊlmənʌɪt/


[mass noun]
A white crystalline mineral, typically occurring as glassy prisms, consisting of hydrated calcium borate.
Example sentences
  • Boron never occurs as a free element, but always as a compound in minerals such as borax (sodium borate; Na 2 B 4 O 7), colemanite (calcium borate; Ca 2 B 6 O 11), and ulexite (sodium calcium borate; NaCaB 5 O 9).
  • I have seen realgar inclusions in colemanite turn yellow in a few months (no oxidation possible).
  • The alternative, calcium hexaborate pentahydrate, is called colemanite and is much less soluble than ulexite.


Named after William T. Coleman (1824–93) + -ite1.

For editors and proofreaders

Line breaks: cole¦man|ite

Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.