Origin of anorthitefrom Classical Greek an-, not + orthos, straight (see ortho-) + -ite
Origin of anorthiteFrom Greek an- not ; see a- 1. orthos straight (from its oblique crystals)
- (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.
- Physical properties:
From Ancient Greek "less than straight, not perpendicular" - a reference to the odd angles at which crystals grow.