Share this entry

Share this page

cummingtonite

Syllabification: cum·ming·ton·ite
Pronunciation: /ˈkəmiNGtəˌnīt
 
/

Definition of cummingtonite in English:

noun

A mineral occurring typically as brownish fibrous crystals in some metamorphic rocks. It is a magnesium-rich iron silicate of the amphibole group.
Example sentences
  • Accessory chlorite, magnetite or ilmenite, titanite, apatite, partly chloritized biotite, epidote, pyrite and sometimes cummingtonite, are present.
  • This rock is a dark gray schistose rock containing radiating aggregates of cummingtonite and occasionally pyrrhotite.
  • The two minerals can have similar distinctive brown colors and are hard to differentiate from each other, although cummingtonite is typically darker and slightly denser.

Origin

early 19th century: named after Cummington, a town in Massachusetts, + -ite1.

Definition of cummingtonite in:

Share this entry

Share this page

 

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day emulous
Pronunciation: ˈemyələs
adjective
seeking to emulate or imitate someone or something