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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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.