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Graphic texture

Encyclopedy Index

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.

Trachyte is a volcanic rock which typically has graphic texture. Devitirified obsidian and other volcanic glasses typically develop graphic textures; pepperite is a typical rock formed by this process.
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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