Definition of anorthosite in English:

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Pronunciation: /əˈnôrTHəˌsīt/


A plutonic rock composed largely of calcic plagioclase.
Example sentences
  • Because of the preponderance of the mineral anorthite (a calcium-rich variety of the mineral plagioclase feldspar) this rock type is called anorthosite.
  • Coarse-grained anorthosite is the predominant rock type in these bodies.
  • The plagioclase crystals would have formed subcircular lenses of anorthosite that punctuated background chromite accumulation.


Mid 19th century: from French anorthose 'plagioclase' + -ite1.

For editors and proofreaders

Syllabification: an·or·tho·site

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