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Definitions of quartz
A form of silica, or silicon dioxide (SiO2), occurring in hexagonal crystals, which are commonly colorless and transparent, but sometimes also yellow, brown, purple, green, and of other colors; also in cryptocrystalline massive forms varying in color and degree of transparency, being sometimes opaque. Webster Dictionary DB
A hard mineral composed of pure silica; the most common of solid minerals, found in many kinds of rock, often in the form of crystals. The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919.
A hard mineral, common in rocks, as in granite. The Concise Standard Dictionary of the English Language. By James Champlin Fernald. Published 1919.
A mineral of pure silica. Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914.
A name applied to numerous varieties of rock-crystal of many shades of colour, or to crystallised silica, known under the various names of rock-crystal, amethyst, siderite, topaz, cairngorm, milk-quartz, rose-quartz, &c. Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
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