anorthositic


an·or·tho·site

A0322300 (ăn-ôr′thə-sīt′)n. An igneous rock consisting almost entirely of plagioclase feldspar, especially the labradorite variety.
[French anorthose, a kind of feldspar (Greek an-, not; see a-1 + Greek orthos, straight) + -ite.]
an·or′tho·sit′ic (-sĭt′ĭk) adj.

anorthositic

(ænˌɔːθəˈsɪtɪk) adjresembling or consisting of anorthosite