E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Moonstone.
A mineral so called on account of the play of light which it exhibits. Wilkie Collins has a novel called The Moonstone.
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“The moonstone contains bluish-white spots, which, when held to the light, present a … . silvery play of colour not unlike that of the moon.”—Ure: Chemical Dictionary.
