a type of gabbro, usually light-colored, made up almost entirely of plagioclase feldspars, esp. labradorite
Origin of anorthositefrom 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 ) -ite 1