Also found in: Thesaurus, Encyclopedia, Wikipedia.
A variety of feldspar valued as a gem for its pearly translucence.
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
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.
Switch to new thesaurus
|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