Definition of vermiculite in English:

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Pronunciation: /vərˈmikyəˌlīt/


A yellow or brown mineral found as an alteration product of mica and other minerals, and used for insulation or as a moisture-retentive medium for growing plants.
Example sentences
  • Clay minerals are mainly illite and chlorite, with only traces of smectite, vermiculite and kaolinite.
  • The deposit was interpreted to have formed by the replacement of biotite by vermiculite under the influence of pegmatitic fluids.
  • These soil mixtures should include sand, peat moss, perlite, vermiculite, and fir bark for adequate drainage.


Early 19th century: from Latin vermiculari 'be full of worms' (because on expansion due to heat, it shoots out forms resembling small worms) + -ite1.

For editors and proofreaders

Syllabification: ver·mic·u·lite

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