an·or·tho·site ( n-ôr th -s t )n. A variety of diorite consisting chiefly of feldspar. [French anorthose, a kind of feldspar (Greek an-, not; see a-1 + Greek orthos, straight) + -ite.] an·or tho·sitic (-s tk) adj. |
anorthosite [ænˈɔːθəˌsaɪt]
n
(Earth Sciences / Geological Science) a coarse-grained plutonic igneous rock consisting almost entirely of plagioclase feldspar
[from French anorthose (see an-, ortho-) + -ite1]
| anorthosite (n-ôrth-st) An igneous rock consisting almost entirely of plagioclase feldspar, especially the labradorite variety. Anorthosites have been identified among rock samples collected from the Moon. |
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