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Myrmekite describes a vermicular, or wormy, intergrowth of quartz in plagioclase. The intergrowths are microscopic in scale, typically with maximum dimensions less than 1 millimeter. The plagioclase is sodium-rich, usually albite or oligoclase. These quartz-plagioclase intergrowths are associated with and commonly in contact with potassium feldspar.
Additional recommended knowledge
These characteristic intergrowths have been explained in a variety of ways. A probable explanation is that the texture was created as plagioclase formed by exsolution from alkali feldspar during cooling, under conditions in which silicon was mobile in the rock. The process does not require that magma be present during myrmekite formation.
Castle, R. O., and Lindsley, D. H., 1993, An exsolution silica-pump model for the origin of myrmekite. Contributions to Mineralogy and Petrology, v. 115, pages 58-65.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Myrmekite". A list of authors is available in Wikipedia.|