Answer: moonstone

AnswerCrossword Clue
MOONSTONE

Feldspar variety

MOONSTONE

Shimmery feldspar gem

MOONSTONE

Pearly gem

MOONSTONE
Collins novel.
MOONSTONE
Famous 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