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Webster 1913 Edition
Anorthite
A-nor′thite
,Noun.
[Gr.
ἀν
priv. + ὀρθόσ
straight (ὀρθή
sc. γωνία
right angle); not in a right angle.] A mineral of the feldspar family, commonly occurring in small glassy crystals, also a constituent of some igneous rocks. It is a lime feldspar. See
Feldspar
.