GEMSTONES TO MINERALSGemstone NameMineral NameAchroiteTourmalineAgateChalcedonyAlexandriteChrysoberylAmazoniteMicrocline FeldsparAmberAmberAmethystQuartzAmetrineQuartzAndalusiteAndalusiteApatiteApatiteAquamarineBerylAventurineChalcedonyBenitoiteBenitoiteBerylBerylBixbiteBerylBloodstoneChalcedonyBrazilianiteBrazilianiteCairngormQuartzCarnelianChalcedonyChrome DiopsideDiopsideChrysoberylChrysoberylChrysoliteOlivineChrysopraseChalcedonyCitrineQuartzCordieriteCordieriteDemantoid GarnetAndraditeDiamondDiamondDichroiteCordieriteDraviteTourmalineEmeraldBerylGarnetPyrope, Almandine, Andradite, Spessartine, Grossularite,UvaroviteGosheniteBerylHeliodorBerylHeliotropeChalcedonyHessoniteGrossulariteHiddeniteSpodumeneIndigolite/IndicoliteTourmalineIoliteCordieriteJadeNephrite or JadeiteJasperChalcedonyKunziteSpodumeneLabradoritePlagioclase FeldsparLapis LazuliLazuriteMalachiteMalachiteMandarin GarnetSpessartineMoonstoneOrthoclase, Plagioclase, Albite, Microcline FeldsparsMorganiteBerylMorionQuartzOnyxChalcedonyOpalOpalPeridotOlivinePleonastSpinelQuartzQuartzRhodochrositeRhodochrositeRhodoliteAlmandine-Pyrope GarnetRubelliteTourmalineRubicelleSpinelRubyCorundumSapphireCorundumSardChalcedonyScapoliteScapoliteSchorlTourmalineSinhaliteSinhaliteSodaliteSodaliteSpinelSpinelSugiliteSugiliteSunstoneOligoclase FeldsparTaaffeiteTaaffeiteTanzaniteZoisiteTitaniteTitanite (Sphene)TopazTopazTourmalineTourmalineTsavorite GarnetGrossulariteTurquoiseTurquoiseUvaroviteUvaroviteVerdeliteTourmalineViolanDiopsideZirconZircon see more on geology.about.com