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definition of the word anorthite

by the Wiktionnary

Greek "less than straight, not perpendicular" - a reference to the odd angles at which crystals grow.

Singular
anorthite

Plural
anorthites

anorthite (plural anorthites)

  1. (mineralogy) A plagioclase feldspar, the final member of the Albite-Anorthite solid solution series. Anorthite is very rare on Earth, but abundant in moon rocks. This is because Anorthite weathers rapidly to clay minerals under atmospheric conditions. Good crystals have been found in lava-digested limestone blocks erupted from Mount Vesuvius.


Definition from Wiktionary
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