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...
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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 show and describe more varieties of rocks and minerals that make attractive gemstones. I also show here some recent agate...
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