Encyclopedy Index |
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Graphic texture is commonly created by exsolution and devitrification and immiscibility processes in igneous rocks. It is called 'graphic' because the exsolved or devitrified minerals form wriggly lines and shapes which are reminiscent of writing.  Graphic granite is a leucocratic granitic rock consisting of alkali feldspar with exolved quartz typically forming a distinctive repetitive pattern soometimes resembling hieroglyphics. Exsolved magnetite has graphic texture, as do some exsolution textures of pyroxene, pyrite feldspar and rarely other minerals. |
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