GEOL 3090 _ GEMS AND GEM MATERIALS.Fall 2016.REVIEW TOPICS FOR EXAM 1 LECTURE1.Color, origin of color, chromophores, phenomena, gemstones that display differentcolors, idiochromatic and allochromatic minerals. Origin of phenomena.2.Gemstone definition, its attributes. Gemstone properties. Gemstones that need specialcare. examples. Basic parts of a cut gem, definition of mineral, species and variety.Atoms, bonding. Gemstones that are not minerals. Simulants and synthetics. Twinning3.Habits in which gems can occur: crystals, poly crystalline aggregates, polimorphs,pseudomorphs4.Different equipment used in non destructive tests for gemstones.5.Different types of gem deposits and the gems that they produce.
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