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American Dictionary of the English Language

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Rock-crystal


ROCK-CRYS'TAL, noun The most perfect variety of silicious earth or quartz; limpid quartz. When purest it is white or colorless, but it is found of a grayish or yellowish white, pale yellow or citron. Its most usual form is that of hexagonal prisms, surmounted by hexagonal pyramids.

ROCK'-DOE, noun A species of deer.