The term serpentine is applied to any of a grouping of hydrous magnesium-rich silicate minerals that are typically gray, green, or white in color. A type of rock that is almost completely composed of serpentine is known as serpentinite.

Associated with subduction zones, serpentinite is a metamorphic rock that is formed from the action of high pressure and heat upon hornblende schists or igneous rocks composed chiefly of mafic minerals, such as peridotite, gabbro, or basalt. The substance is most often found in areas where mountain ranges have formed due to the sealing off of an ocean basin. For instance, the Coast Ranges in California, where serpentinite is the official state rock, primarily consist of slices of the ocean’s crust that have been faulted and folded along the coastline. Relatively weak, mountains containing high levels of serpentinite may suffer from recurrent landslides and a brisk erosion process.

Due to its derivation from the Earth’s mantle, protrusions of serpentinite are often quite different from the environment that surrounds them. Indeed, the rock’s low levels of calcium and potassium, as well as its significant amounts of such potentially harmful substances as chromium and nickel, would seem to make it an unlikely place for habitation. However, some plant species have been able to successfully adapt to the unusual characteristics of serpentinite. For example, in Presidio of San Francisco, which is part of the Golden Gate National Recreation Area, several endangered species of plants have become acclimatized to life on serpentinite outcrops.

Questions or comments? Send us an email.

© 1998-2022 by Michael W. Davidson and The Florida State University. All Rights Reserved. No images, graphics, 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: Friday, Nov 13, 2015 at 01:19 PM

Access Count Since November 20, 2003: 15563

For more information on microscope manufacturers,
use the buttons below to navigate to their websites: