Polarized Light Microscopy Digital Image Gallery

Margarite

Margarite is a mica that features calcium as the interlayer of cations that holds each sheet of the mineral together. The substitution of this element for those more commonly included in micas results in a less flexible mineral. Thus, although margarite still exhibits the perfect cleavage characteristic to most micas, the thin sheets it produces when cleaved are not as bendable as those of many other varieties. Margarite is, therefore, classified as one of the brittle micas. White, gray, yellowish, or pink in color, margarite typically displays a pearly luster, its name stemming from the Greek word for “pearl.” The mineral generally occurs in low and medium-grade metamorphic rocks, such as mica schists, and often in association the aluminum oxide mineral corundum, which readily weathers to margarite and other aluminous minerals.


© 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: 5948
Microscopes provided by:
Visit the Nikon website. Visit the Olympus Microscopy Resource Center website.