moon·stone /-ˌston/
月長石
Moon·stone n. Min. A nearly pellucid variety of feldspar, showing pearly or opaline reflections from within. It is used as a gem. The best specimens come from Ceylon.
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moonstone
n : a transparent or translucent gemstone with a pearly luster;
some specimens are orthoclase feldspar and others are
plagioclase feldspar