noun thom·son·ite \ˈtäm(p)səˌnīt\

Definition of thomsonite



  1. :  a mineral NaCa2Al5Si5O20.6H2O of the zeolite family consisting of a hydrous silicate of aluminum, calcium, and sodium, occurring generally in masses of a radiated structure or rarely in distinct orthorhombic crystals, and being snow-white when pure (hardness 5–5.5)

Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of thomsonite

Thomas Thomson †1852 Scottish chemist + English -ite

Seen and Heard

What made you want to look up thomsonite? Please tell us where you read or heard it (including the quote, if possible).


a trip made at another's expense

Get Word of the Day daily email!