Sand_under_electron_microscope.jpg
Summary
Description Sand under electron microscope.jpg | 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. |
Date | not specified |
Source | http://mix.msfc.nasa.gov/abstracts.php?p=743 |
Author | NASA |
Permission
( Reusing this file ) |
US government, public domain |
Licensing
Public domain Public domain false false |
This file is in the public domain in the United States because it was solely created by NASA . NASA copyright policy states that "NASA material is not protected by copyright unless noted ". (See Template:PD-USGov , NASA copyright policy page or JPL Image Use Policy .) | ||
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