Eʼelyaaígíí:Sand under electron microscope.jpg

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Summary

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.
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 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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kʼadígíí21:25, 28 Tʼą́ą́chil 2006thumbnailígíí (21:25, 28 Tʼą́ą́chil 2006)270 × 210 (16 KIIŁTSOHʼÍÍŁKÉ)Holly Cheng{{Information | Description=Sand under an electron microscope. | Source=http://exploration.nasa.gov/articles/06dec_dunes.html | Date=not specified | Author=NASA | Permission=US government, public domain }}

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