Moonstone definitions

mo͝on'stōn'
A variety of feldspar valued as a gem for its pearly translucence.
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A milky-white, translucent feldspar with a pearly luster, used as a gem.
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(mineralogy) A translucent gemstone, an orthoclase feldspar, that has a pearly lustre.
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Origin of moonstone

moon +"Ž stone