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Town Mountain Granite, Precambrian age, Enchanted Rock, Enchanted Rock State Natural Area, Llano County, Texas 1 | by Alan Cressler
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Town Mountain Granite, Precambrian age, Enchanted Rock, Enchanted Rock State Natural Area, Llano County, Texas 1

The primary components of Town Mountain Granite include: Potassium feldspar (pink), Biotite (black), Quartz, (whitish), Plagioclase feldspar (milky white). For more information: uts.cc.utexas.edu/~rmr/tmg.html

mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=TXpCAt%3B0

 

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Taken on September 27, 2014