In a previous page, Part 1, I offered pictures and descriptions of common beach rocks found on Lake Superior beaches. In a seccond page, Part 2, I show some beach rocks & minerals, and some agates, that can be polished into attractive gemstones. In this page, Part 3, I continue to ...
It'll be a snap to identify gemstones once Robert Downs finishes his library of spectral fingerprints for all the Earth's minerals. Downs is almost halfway there. So far, the associate professor of geosciences at The University of Arizona in Tucson has cataloged about 1,500 of the approxima...
Rocks: Galleries of igneous, sedimentary and metamorphic rock photos with descriptions. Minerals: Information about ore minerals, gem materials and rock-forming minerals. Volcanoes: Articles about volcanoes, volcanic hazards and eruptions past and present. Gemstones: Colorful images and articles about diam...