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Graphic texture

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. Devitrified 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 exsolved quartz typically forming a distinctive repetitive pattern sometimes resembling hieroglyphics.

Exsolved magnetite has graphic texture, as do some exsolution textures of pyroxene, pyrite feldspar and rarely other minerals.

See also

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Graphic_texture". A list of authors is available in Wikipedia.
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