Polarized Light Microscopy Digital Image Gallery

Welded Tuff

Many large geologic formations, such as cliffs, hills, and mountains, are often composed of tuff. Within these natural structures, the rock differs significantly in constitution and hardness. In some place, for instance, the tuff may be relatively soft and crumbly, while in others it may be more compact and block-like. These differences primarily depend upon how much a tuff has been welded together. The degree of welding is determined by how hot the volcanic ash that forms a tuff was when it accumulated at the surface of the Earth; the warmer the material, the easier it is for the glass particles to weld together under the weight of overlying deposits.


© 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: 5546
Microscopes provided by:
Visit the Nikon website. Visit the Olympus Microscopy Resource Center website.