graf·​ton·​ite | \ ˈgraftəˌnīt \
plural -s

Definition of graftonite

: a mineral (Fe,Mn,Ca)3(PO4)2 consisting of an iron manganese calcium phosphate occurring in salmon-pink laminated intergrowths with triphylite (hardness 5, specific gravity 3.7)

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!

History and Etymology for graftonite

Grafton, New Hampshire + English -ite

Learn More About graftonite

Dictionary Entries Near graftonite

grafting wax


graft-versus-host disease

See More Nearby Entries 

Statistics for graftonite

Cite this Entry

“Graftonite.” Dictionary, Merriam-Webster, Accessed 5 Dec. 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'?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Love words? Need even more definitions?

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