Pegmatitic Texture

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Pegmatitic Texture

 

(also graphic texture and granophyric texture), a term that describes the physical appearance and character of magmatic rocks that exhibit close intergrowths as a result of the simultaneous crystallization of quartz and feldspar. The latter mineral usually forms large crystals that enclose numerous, identically oriented intergrowths of quartz. Pegmatitic texture is most common to certain zones of granite-pegmatite veins.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.