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AnorthositeAn usually dark-colored igneous rock consisting mostly or entirely of calcic plagioclase.
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AnorthositeAn igneous rock made up almost entirely of plagioclase feldspar. This rock dominates the lunar highlands.
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Anorthosite
(rock) A phaneritic, intrusive igneous rock characterized by a predominance of plagioclase feldspar.
* '''1863''', T. Sterry Hunt, "On the Chemical and Mineralogical Relations of Metamorphic Rocks" [..]
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