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A variety of feldspar valued as a gem for its pearly translucence.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Minerals) a gem variety of orthoclase or albite that is white and translucent with bluish reflections
2. (Jewellery) a gem variety of orthoclase or albite that is white and translucent with bluish reflections
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. a semitransparent or translucent, opalescent, pearly blue variety of adularia, used as a gem.
2. any opalescent feldspar, as certain varieties of albite, labradorite, or oligoclase, used as gems.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||moonstone - a transparent or translucent gemstone with a pearly luster; some specimens are orthoclase feldspar and others are plagioclase feldspar|
feldspar, felspar - any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium
transparent gem - a gemstone having the property of transmitting light without serious diffusion
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