anorthite

詳細解釋：

an.or.thite

n.（名詞）
A rare plagioclase feldspar with high calcium oxide content occurring in igneous rocks.
鈣長石：一種氧化鈣含量很高稀有斜長石，多出現於火成岩中

來源：
From Greek an- [not] * see a-
源自 希臘語 an- [不] *參見 a-
orthos [straight (from its oblique crystals)]
orthos [直的（從其斜狀水晶）]