Moonstone

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Moonstone \Moon"stone`\ (m[=oo]n"st[=o]n`), 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.
     [1913 Webster]



From WordNet (r) 2.0 [wn]:

  moonstone
       n : a transparent or translucent gemstone with a pearly luster;
           some specimens are orthoclase feldspar and others are
           plagioclase feldspar