Anorthite ma'adinai ne kuma nau'in plagioclase feldspar wanda ke da dabarar sinadarai CaAl2Si2O8. Wani ma'adinai ne na fari ko launin toka wanda aka fi samunsa a cikin duwatsu masu zafi kamar basalt da gabbro. Anorthite ana kiransa bayan abun da ke tattare da anorthite, wanda ke da babban abun ciki na alli idan aka kwatanta da sauran plagioclase feldspars. Sunan "anorthite" ya fito daga kalmomin Helenanci "an" ma'ana ba, da "orthos" ma'ana daidai, yana nufin al'adar crystal na ma'adinai.