Answer: moonstone

AnswerCrossword Clue
MOONSTONEFeldspar variety
MOONSTONEShimmery feldspar gem
MOONSTONEPearly gem
MOONSTONECollins novel.
MOONSTONEFamous mystery novel (with "The").
MOONSTONE1868 novel (with "The").
MOONSTONEGem
MOONSTONEGem in a Wilkie Collins novel
MOONSTONECursed article in a Collins classic
MOONSTONESubject of a Wilkie Collins classic
MOONSTONEOpalescent gem
MOONSTONEOpal alternative
moonstoneA pearly white semiprecious stone consisting of alkali feldspar
moonstonea nearly pellucid variety of feldspar, showing pearly or opaline reflections from within