Anorthosite
a granular plutonic rock composed largely of labradorite or a more calcic feldspar.
historical examples
in canada great portions of the eastern portion of the dominion are formed of gabbros, norite, anorthosite and allied rock types.
encyclopaedia britannica, 11th edition, volume 11, slice 4 various
noun
a co-rs–grained plutonic igneous rock consisting almost entirely of plagioclase feldspar
anorthosite
(ān-ôr’thə-sīt’)
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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