Definition of anorthite in English:


Syllabification: an·or·thite
Pronunciation: /anˈôrˌTHīt


  • A calcium-rich mineral of the plagioclase feldspar group, typically white, occurring especially in limestones metamorphosed by contact with an igneous intrusion.
    More 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.

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