Polarized Light Microscopy Digital Image Gallery

Augen Gneiss

Gneisses are classified based upon a variety of characteristics, such as constituent minerals, parent materials, and chemical composition. Some, such as augen gneiss, are also described based upon their structure. This type of gneiss gains its name from the elliptic or lens-shaped form of many of its mineral grains. Indeed, the word augen is German for “eye,” a reference to the appearance of these readily visible components of metamorphic rocks. To some people, an augen structure appears more akin to nuts than eyes. In fact, the scenic Hickory Nut Gorge in North Carolina is believed to have been named for the nut-shaped minerals found in much of the exposed rock present in that location.


© 1995-2013 by Michael W. Davidson and The Florida State University. All Rights Reserved. No images, graphics, software, scripts, or applets may be reproduced or used in any manner without permission from the copyright holders. Use of this website means you agree to all of the Legal Terms and Conditions set forth by the owners.
This website is maintained by our
Graphics & Web Programming Team
in collaboration with Optical Microscopy at the
National High Magnetic Field Laboratory.
Last modification: Thursday, Nov 20, 2003 at 03:51 PM
Access Count Since November 20, 2003: 6546
Microscopes provided by:
Visit the Nikon website. Visit the Olympus Microscopy Resource Center website.