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Webster 1913 Edition

Moonstone

Moon′stoneˊ

(moōn′stōnˊ)
,
Noun.
(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.

Webster 1828 Edition

Moonstone

MOON'STONE

,
Noun.
A variety of adularia, of a white color, or a yellowish or greenish white, somewhat iridescent, found in blunt amorphous masses, or crystallized in truncated rhomboidal prisms, or in rectangular tables, or in hexahedral prisms beveled at both ends. The surface is often sulcated.

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