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anorthosite
an·or·tho·site [ a náwrthə st ]


noun 
Definition:
 
coarse-grained igneous rock: a coarse-grained igneous rock composed of at least 90 percent feldspar
[Mid-19th century. < French anorthose, type of feldspar < Greek anorthos "not straight"; from its crystals]

an·or·tho·si·tic [ a nàwrthə síttik ] adjective
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