a type of gabbro, usually light-colored, made up almost entirely of plagioclase feldspars, esp. labradorite
Origin of anorthosite; from French anorthose ; from Classical Greek an-, not + orthos (see anorthite) + -ite
An igneous rock consisting almost entirely of plagioclase feldspar, especially the labradorite variety.
Origin of anorthositeFrench anorthose, a kind of feldspar (Greek an-, not; see a–1 + Greek orthos, straight) + –ite1.