Image: Sand under electron microscope
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Description: Grains of so-called “Ottawa Silica Sand” under an electron microscope. Magnification 150x. “Ottawa Sand” is a by-product of hydraulic mining of Ordovician orthoquartzites of the St. Peter Sandstone Formation of the Paleozoic intracratonic Illinois Basin.
Title: Sand under electron microscope
Credit: http://mix.msfc.nasa.gov/abstracts.php?p=743
Author: NASA
Permission: US government, public domain
Usage Terms: Public domain
License: Public domain
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