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colemanite Line breaks: cole¦man|ite
Pronunciation: /ˈkəʊlmənʌɪt/

Definition of colemanite in English:


[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.

Definition of colemanite in:
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