amphibole group


Definition of amphibole group

: a group of minerals (as anthophyllite, tremolite, actinolite, and hornblende) with essentially like crystal structures involving a silicate chain [OH(Si4O11)]n and generally containing three groups of metal ions, the large ions being sodium and calcium, the intermediate being chiefly bivalent iron, magnesium, and manganese, and the small ions chiefly silicon with some aluminum and rarely ferric iron, the general formula for the group being A2B5(Si, Al)8O22(OH) 2

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.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of amphibole group

1828, in the meaning defined above

Learn More About amphibole group

Time Traveler for amphibole group

Time Traveler

The first known use of amphibole group was in 1828

See more words from the same year

Dictionary Entries Near amphibole group


amphibole group


See More Nearby Entries 

Statistics for amphibole group

Cite this Entry

“Amphibole group.” Dictionary, Merriam-Webster, Accessed 30 Nov. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon


Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!