Graphic Texture

A graphic texture is an igneous rock texture in which an intergrowth of two minerals has the appearance of runic writing.
Rocks containing abundant graphic textures can be described as granophyric. Graphic textures are most commonly intergrowths of quartz and alkali feldspar in which the quartz appears as v-shaped inclusions enclosed by the feldspar. A micrographic texture is a graphic intergrowth than can only be observed under the microscope. Graphic textures have been suggested to originate by simultaneous crystallisation of phases from a silicate melt in the presence of a hydrous fluid phase.

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Graphic granite. Star Beach Granite, Brazil. Image from James St. John


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Graphic granite. Amazon Gold Granite, Brazil. Image from James St. John


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Graphic granite. Image from James St. John



Bibliography



• Cox et al. (1979): The Interpretation of Igneous Rocks, George Allen and Unwin, London.
• Howie, R. A., Zussman, J., & Deer, W. (1992). An introduction to the rock-forming minerals (p. 696). Longman.
• Le Maitre, R. W., Streckeisen, A., Zanettin, B., Le Bas, M. J., Bonin, B., Bateman, P., & Lameyre, J. (2002). Igneous rocks. A classification and glossary of terms, 2. Cambridge University Press.
• Middlemost, E. A. (1986). Magmas and magmatic rocks: an introduction to igneous petrology.
• Shelley, D. (1993). Igneous and metamorphic rocks under the microscope: classification, textures, microstructures and mineral preferred-orientations.
• Vernon, R. H. & Clarke, G. L. (2008): Principles of Metamorphic Petrology. Cambridge University Press.


Photo
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Graphic intergrowths of quartz in microcline. XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in microcline. XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in microcline. XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in microcline. XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in microcline. XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in microcline. XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in orthoclase (you can see the difference in relief between quartz and orthoclase). PPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 10x (Field of view = 2mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 2x (Field of view = 7mm)
grafica2013(3).jpg

Graphic intergrowths of quartz in orthoclase. XPL image. 2x (Field of view = 7mm)
grafica2013(4).jpg

Graphic intergrowths of quartz in orthoclase. XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in orthoclase. XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in microcline. XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in microcline. XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in microcline. XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in microcline. XPL image. 2x (Field of view = 7mm)
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Graphic intergrowths of quartz in microcline. XPL image. 2x (Field of view = 7mm)