Share this entry
colemanite Syllabification: cole·man·ite
Pronunciation: /ˈkōlməˌnīt/

Definition of colemanite in English:


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.

Definition of colemanite in:
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.

Subscribe to remove ads and access premium resources