Curves for pink pegmatite create an abstract texture along a cliff wall seen from Ceder Point in the Black Canyon National Park.


"Pink streamers of pegmatite animate the towering cliffs of the canyon at Painted Wall overlook. This granite-like igneous rock formed as hot magma forced its way into cracks. It cooled slowly, allowing large crystals to form. The pegmatite is loaded with shiny muscovite (mus'-ko-vite) mica and large crystals of a pinkish mineral called potassium feldspar." (from the Black Canyon National Park Service web site http://www.nps.gov/blca/naturescience/precambrian.htm)

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From American Midwest