Polarized Light Microscopy Digital Image Gallery

Arfvedsonite Granite

In alkali granites, arfvedsonite is a common constituent, as are other sodic-amphiboles and pyroxenes. The mineral, which was first discovered in Greenland and is named for Swedish chemist Johan Arfvedson, is an iron-rich sodium silicate. It is dark green or black in color and has a relative hardness of 6. Deposits of alkali granite can be found in various locales, such as New England and Norway, but are most extensive in Nigeria.


© 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 02:51 PM
Access Count Since November 20, 2003: 6413
Microscopes provided by:
Visit the Nikon website. Visit the Olympus Microscopy Resource Center website.