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GRAN'ITE, n. In mineralogy, an aggregate stone or rock, composed of crystalline grains of quartz, feldspar and mica, or at least of two of these minerals, united without a cement, or confusedly crystallized. The grains very in size from that of a pin's head, to a mass of two or three feet; but usually the largest size is that of a nut. The color of granit is greatly diversified by the different colors and proportions of the component parts, and in general these stones are very hard.
A crystalline, granular rock, consisting of
quartz, feldspar, and mica, and usually of a whitish, grayish, or
flesh-red color. It differs from gneiss in not having the mica in
planes, and therefore in being destitute of a schistose
structure.
* Varieties containing hornblende are common. See also the Note under Mica. Gneissoid granite, granite in which the mica
has traces of a regular arrangement. -- Graphic
granite, granite consisting of quartz and feldspar
without mica, and having the quartz crystals so arranged in the
transverse section like oriental characters. --
Porphyritic granite, granite containing
feldspar in distinct crystals. -- Hornblende
granite, or Syenitic granite, granite
containing hornblende as well as mica, or, according to some
authorities hornblende replacing the mica. -- Granite
ware. | ||||||||