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Unformatted text preview: -Color: Colorless generally preferred Rubies and Sapphires-Gem variety of the common mineral Corundum (Al203)-Found mostly in metamorphic rocks where the original rock had a high alumina content Emerald-Emerald is the gem variety of Beryl (more valuable than diamonds or gold)-Origin: Usually found in igneous rocks (granites), but also in hydrothermal veins-The finest come from Columbia Time for a Gem Test a. William Ralston (president of San Francisco bay in late 1800s) and Clarence King (geologist) surveying the site along to route to transcontinental railroad...
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This note was uploaded on 09/09/2009 for the course GEO 301 taught by Professor Long during the Spring '07 term at University of Texas at Austin.
- Spring '07