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Unformatted text preview: Gemstones Test 1 Study Sheet What is a Gemstone? Material used for adornment or decoration Relatively rare Hard (scratch surface) Tough (break) Withstand corrosion from skin Gemmology: the field of study that encompasses the identification, evaluation of quality, valuation (pricing), and science of gems Gems are either natural materials or non-natural materials Natural Materials (formed by earth processes) 1) Native Element- natural occurring element that has one chemical element (Ex. Au, Ag, Cu) 2) Mineral- naturally occurring inorganic chemical compound (Ex. Quartz SiO 2 ) 3) Biomineral- chemical compound secreted by a living organism (Ex. Calcium Carbonate CaCO 3 ) Non-Natural Materials (human-made) 4) Synthetic Chemical Compound- made in a lab (Ex. Ruby, Emerald, Opal) 5) Synthetic Monoelemental Compound- made in a lab (Ex. Diamond) Mohs Scale of Hardness Talc is ranked 1 and is the softest, while diamond is ranked 10 and is the hardest Most important abrasive used in making gemstones is carborundum...
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- Fall '08