Abstract

Some micrographic intergrowths in a small pegmatite dike from Sebs Mountains and in alkali granites from Banat Province have formed by replacement of feldspar or other minerals by quartz. The main textural features of these intergrowths are 1) The graphic quartz is skeletal, and the same skeletal quartz is sometimes included in two or more crystal hosts; 2) Occasionally the feldspar host is obviously deformed, whereas intergrown graphic quartz is nondeformed, 3) Some graphic quartz tends to develop along interfaces between feldspar or other mineral crystals, as well as along cleavage planes, fractures, slips, and deformation bands of its feldspar host.

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