anorthitePronunciation: /əˈnɔːθʌɪt/Definition of anorthite noun [mass noun] a calcium-rich mineral of the feldspar group, typically white, occurring in many basic igneous rocks. Origin: mid 19th century: from an-1 + Greek orthos 'straight' + -ite1anorthite in other Oxford dictionaries Definition of anorthite in the US English dictionary
