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.

Bibliography



• Deer, W.A., Howie, R.A., Zussman, J. (1998) Rock-forming Minerals.
• Optical Mineralogy : The Nonopaque Minerals by Phillips / Griffen
• Eric A.K.Middlemost (1985): Magmas and Magmatic Rocks. Longman, London
• Ron H. Vernon (2004): A pratical guide to rock microstructure. Cambridge editore


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)
microclinografico(5).jpg

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)
grafidca(2).jpg

Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
grafidca(3).jpg

Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
grafidca(4).jpg

Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
grafidca(5).jpg

Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
grafidca(7).jpg

Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
grafidca(8).jpg

Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
tessituramiicrograficaa(2).jpg

Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
tessituramiicrograficaa(3).jpg

Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
tessituramiicrograficaa(4).jpg

Graphic intergrowths of quartz in orthoclase. XPL image. 2x (Field of view = 7mm)
tessituramiicrograficaa(5).jpg

Graphic intergrowths of quartz in orthoclase. XPL image. 2x (Field of view = 7mm)
tessituramiicrograficaa(9).jpg

Graphic intergrowths of quartz in orthoclase. XPL image. 10x (Field of view = 2mm)
tessituramiicrograficaa(7).jpg

Graphic intergrowths of quartz in orthoclase (you can see the difference in relief between quartz and orthoclase). PPL image. 10x (Field of view = 2mm)
tessituramiicrograficaa(8).jpg

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)
tessituragraficagavorrano(4).jpg

Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 2x (Field of view = 7mm)
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Tessitura grafica al bordo di un feldspato alcalino. Granito di Gavorrano. Immagine NX, 2x (lato lungo = 7mm)
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Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 2x (Field of view = 7mm)
tessituragraficagavorrano(7).jpg

Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 2x (Field of view = 7mm)
tessituragraficagavorrano(8).jpg

Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 2x (Field of view = 7mm)
tessituragraficagavorrano(9).jpg

Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 10x (Field of view = 2mm)
tessituragraficagavorrano(10).jpg

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)
tessituragraficagavorrano(12).jpg

Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 10x (Field of view = 2mm)
tessituragraficagavorrano(13).jpg

Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 10x (Field of view = 2mm)
tessituragraficagavorrano(14).jpg

Graphic intergrowths of quartz in orthoclase. Gavorrano granite (tuscany, Italy). XPL image. 10x (Field of view = 2mm)
grafica2013(2).jpg

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

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)
grafica2013(2).jpg

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)
grafica2013(5).jpg

Graphic intergrowths of quartz in orthoclase. XPL image. 2x (Field of view = 7mm)
grafica2013(6).jpg

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

Graphic intergrowths of quartz in microcline. XPL image. 2x (Field of view = 7mm)
grafica2013(8).jpg

Graphic intergrowths of quartz in microcline. XPL image. 2x (Field of view = 7mm)
grafica2013(9).jpg

Graphic intergrowths of quartz in microcline. XPL image. 2x (Field of view = 7mm)
grafica2013(10).jpg

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