Granite
Written by Boss Tambang Tuesday, 01 December 2009 23:04
This distinctive pink granite forms most of Pikes Peak, Colorado. Its major constituent is the pink-orange mineral potassium feldspar. The gray, clear mineral is quartz, which is diagnostic of granite—that is, a rock without quartz, no matter what else is in it, cannot be called granite. There are also a few rare white grains of orthoclase feldspar, and also a darker mineral—don’t quote me, but I think it might be phlogopite.
Like most granite, this rock is igneous and plutonic, that is, it came to this location in a molten state and in a large, deeply buried body or pluton. Granite can also form through long and intense metamorphism of other igneous or sedimentary rocks. The random arrangement of grains in the Pikes Peak granite—its lack of fabric—is evidence for a plutonic origin.
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