The American Geological Institute is a nonprofit federation of 34 geoscientific and professional associations that represent more than 100,000 geologists, geophysicists, and other earth scientists.
Mineralogy Provides database of minerals with formula and system.
Minerals are listed with formula and system, ordered according to Strunz classification. Balcones Escarpment Full text of The Balcones Escarpment, edited by Patrick L. Abbott and C.M. Woodruff, Jr., 1986. Cascades Volcano Observatory Features information about the volcanoes in the Cascades Range and domestic volcanoes. Describes volcano features, hazards, and monitoring techniques. In addition, CVO provides hydrologic information and links to related sites.