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Anorthite
noun
Definitions
Noun
- 1 A variety of plagioclase feldspar, the calcium endmember of that series. countable, uncountable
- 2 rare plagioclastic feldspar occurring in many igneous rocks wordnet
Etymology
From Ancient Greek αν- (an-, “not”) + ὀρθός (orthós, “straight”) "not perpendicular; less than straight", in reference to its odd.
See also for "anorthite"
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