moonstone

名词 moonstone:

1. a transparent or translucent gemstone with a pearly luster; some specimens are orthoclase feldspar and others are plagioclase feldspar

moon.stone

n.（名词）
A variety of feldspar valued as a gem for its pearly translucence.
月长石：一种因为具有珍珠半透明的光泽而被视为宝石的长石