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Texture in igneous rocks
Graphic granite from the Einerkilen uranium mine in Evje, NorwayGraphic granite from the Einerkilen uranium mine in Evje, NorwayGraphic granite, southwestern Kola Peninsula, RussiaGraphic texture in a rock roughly 10x10 centimeters with feldspar (white) and quartz (gray, cuneiform)
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 lines and shapes which are reminiscent of writing.
Graphic granite is a leucocratic granitic rock consisting of alkali feldspar with exsolved quartz typically forming a distinctive repetitive pattern sometimes resembling cuneiform writing. Experiments have shown that graphic granite texture is derived from large single crystals of quartz and feldspar interleaving to create the cuneiform illusion.
Exsolved magnetite has graphic texture, as do some exsolution textures of pyroxene, pyritefeldspar and rarely other minerals.
