graphic intergrowth

graphic intergrowth

[¦graf·ik ′in·tər‚grōth]
(petrology)
An intergrowth of crystals, commonly feldspar and quartz, that produces a type of poikilitic texture in which the larger crystals have a fairly regular geometric outline and orientation, and resemble cuneiform writing.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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In some samples perthite and quartz also occur in graphic intergrowths. The feldspars are fresh to slightly cloudy and sparingly show mantles of plagioclase around perthite (rapakivi-type) or vice versa.