One of the mysteries of the English language finally explained.
A calcium-rich mineral of the plagioclase feldspar group, typically white, occurring especially in limestones metamorphosed by contact with an igneous intrusion.
- ‘The relative effect of anorthite on predicted melt compositions is indicated.’
- ‘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.’
- ‘Lunar settlers could extract oxygen from the minerals ilmenite and anorthite.’
Mid 19th century: from an- + Greek orthos ‘straight’ + -ite.
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