Granophyric Texture

A granophyric texture is an intergrowth of quartz and alkali feldspar in an igneous rock that is less well defined than a graphic texture and often is somewhat radiating.

Granophyric texture can be similar to micrographic texture and to the coarser graphic intergrowths of quartz and alkali feldspar common in pegmatite.
These textures document simultaneous crystallization of quartz and feldspar from a silicate melt at the eutectic point, perhaps in the presence of a water-rich phase. They may also be formed by crystallization when the magma is significantly undercooled, not necessarily under eutectic conditions.

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
granitografico(2).jpg

Granophyre with graphic intergrowths of quartz and alkali feldspar. XPL image. 2x (Field of view = 7mm)
granitografico(3).jpg

Granophyre with graphic intergrowths of quartz and alkali feldspar. XPL image. 2x (Field of view = 7mm)
granitografico(4).jpg

Granophyre with graphic intergrowths of quartz and alkali feldspar. XPL image. 2x (Field of view = 7mm)
granitografico(5).jpg

Granophyre with graphic intergrowths of quartz and alkali feldspar. XPL image. 2x (Field of view = 7mm)
granitografico(6).jpg

Granophyre with graphic intergrowths of quartz and alkali feldspar. XPL image. 2x (Field of view = 7mm)
granitografico(7).jpg

Granophyre with graphic intergrowths of quartz and alkali feldspar. XPL image. 2x (Field of view = 7mm)
granitografico(8).jpg

Granophyre with graphic intergrowths of quartz and alkali feldspar. XPL image. 2x (Field of view = 7mm)
granitografico(10).jpg

Granophyre with graphic intergrowths of quartz and alkali feldspar. XPL image. 2x (Field of view = 7mm)
granitografico(11).jpg

Granophyre with graphic intergrowths of quartz and alkali feldspar. XPL image. 2x (Field of view = 7mm)
granitografico(12).jpg

Granophyre with graphic intergrowths of quartz and alkali feldspar. XPL image. 2x (Field of view = 7mm)
granitografico(13).jpg

Granophyre with graphic intergrowths of quartz and alkali feldspar. XPL image. 2x (Field of view = 7mm)
granitografico(14).jpg

Granophyre with graphic intergrowths of quartz and alkali feldspar. XPL image. 2x (Field of view = 7mm)