Sand under electron microscope.jpg

Summary[ ]


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
Author NASA
(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 JPL Image Use Policy.)
NASA logo.svg

  • Use of 14 CFR 1221.
  • The NASA website hosts a large number of images from the Soviet/ Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
  • Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the Cc-Hubble}}.
  • The [2]
  • Images featured on the [3]
  • The photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."