geology solution document

May 11th, 2015
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GEOLOGY 115COLORED GEMSTONESA-ZImages 2006 Barbara SmigelAGATE Cryptocrystallineaggregate of quartz Translucent to opaque Banded, multicolored Lots of named types Ex. Botswana Agate Ex. Mexican LaceAgate Good jewelry stoneAMBER/AMETRINE AMBER Organic, fossilized resin fromBaltic or Dominican Republic Soft, sensitive to chemicals Many enhancements andimitations AMETRINE Bi-colored variety of quartzfrom Bolivia Can be cut to separate or blendcolors Synthetics are madeAMETHYST Purple, single crystal quartz Many shades such as: Siberian Rose d France Good jewelry stone Brazil, Uruguay & Zambiamajor sources Fashioned in many ways Birthstone for FebruaryAMMOLITE/ANDALUSITE AMMOLITE: Fossilized ammonite shell,Canada is major source Iridescent Stabilized for durability ANDALUSITE Pleochroic Lesser known jewelrystone H = 7.5 Brazil is major sourceAPATITE APATITE Delicate gem: H =5, cleavable, heatsensitive Phosphate mineral(similar to that inyour teeth) Yellow, green andblue green Catseyes occurAQUAMARINE BLUE GREEN TO BLUEBERYL H = 7.5 Good jewelry stone Colors from pale to mediumdark Transparent to opaque Fashioned many ways Brazil is major source, Africa,for darker stones Generally heated March BirthstoneAXINITE/AZURITE AXINITE Rare collector s

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