Definition of anorthite in English:

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Pronunciation: /əˈnôrˌTHīt/


A calcium-rich mineral of the plagioclase feldspar group, typically white, occurring especially in limestones metamorphosed by contact with an igneous intrusion.
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.
  • Late phases are mainly calcic amphiboles of magnesio-hornblende composition and plagioclases with very low anorthite contents.
  • The relative effect of anorthite on predicted melt compositions is indicated.


Mid 19th century: from an-1 + Greek orthos 'straight' + -ite1.

For editors and proofreaders

Syllabification: an·or·thite

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