Dixon, Dougal, 1992, The Practical Geologist: The Introductory Guide to the Basics of Geology and to Collecting and Identifying Rocks. Simon and Schuster: New York.
Johnsen, O., 2002, Minerals of the world. Princeton University Press: Princeton, NJ.
National Audubon Society, 1979, Field Guide to North American Rocks and Minerals. National Audubon Society Field Guides: New York.
Mitchell, J., 2008, The rockhound’s handbook. Gem Guides Book Co.: Baldwin Park, CA.