chrysoberyl12BeAl2O4，常含(Danieletal.,3

變石，Cr2O3→blue&redcolorsCr2O3～2%45最優(yōu)質(zhì)的變石是日光下色，燈光下紅寶石色。但6受人們喜愛(ài)。據(jù)說(shuō)，還曾有一種白藍(lán)色，比貓眼和變加7 (Danieletal.,8Maindeposit Contactandregional(Danieletal.,9

(Danieletal., ChrysoberylChrysoberylinrare-elementpegmatites偉晶巖體侵入到花崗巖、片麻巖和云母片巖中（巴西（Cassedanne&Roditi，英細(xì)脈中（巴西）（Cassedanne&Roditi1993） 的BlackHill礦區(qū)（?erny,2002）

Contactandregional Thepegmatiteintrudingultramaficrockmodel Franzetal.,2002;Fuertesetal.,Contactandregional ThepegmatiteintrudingultramaficrockmodelContactandregional Thepegmatiteintrudingultramaficrockmodel綠寶石礦床有相似的成因（Martin-Izardetal.,1995）etal.,1995;Fuertes-Fuenteetal.,2000）。Be-B-P、水以及Si、Al和K（直閃石）和Contactandregional Thepegmatiteintrudingultramaficrockmodel（吸收了偉晶巖中的水和Si后）在侵入體的底部結(jié)⑤在接觸交代帶中，電氣石、磷灰石、亞歷山大變石和硅 Contactandregional Thepegmatiteintrudingultramaficrockmodel相似的地質(zhì)和交代特征Franqueira礦區(qū)范圍大概有15-20米(maybepartofalargersystem)，Tokovaja礦區(qū)更大Be的礦物都形成在酸性巖（花崗巖和偉晶巖）和超基Be、B和P的流體遷移（侵入）到更加基性的巖石中，Contactandregional Thepegmatiteintrudingultramaficrockmodel在巴西erraa地區(qū)大型的ia 金綠寶石產(chǎn)出在偉晶巖體依次侵入到石英巖和富中e&，）Contactandregional TheThemetamorphic/anatexismodelChrysoberylformedviametasomaticreactionsbetweensilica-poorcountryrocksandpegmatite.典型的礦區(qū)代表是在西澳大利亞的達(dá)爾文地區(qū)發(fā)現(xiàn)的與富Contactandregional TheThemetamorphic/anatexismodel等礦物區(qū)域性分布（Downes&Bevan,2002）Be的來(lái)源主要是片麻巖（Be~10Contactandregional TheThemetamorphic/anatexismodelTheKolsvaincentralSweden&theMar?ikovinCzechBeryl+4K-feldspar+4H+→3chrysoberyl+18quartzBeryl+K-feldspar+H2O→chrysoberyl+phenakiteFranzFranz&Morteani,Contactandregional Themetamorphic/anatexismodelContactandregional TheThemetamorphic/anatexismodel6K-feldspar+beryl+6H2O+8chrysoberyl+6muscovite+66K-feldspar+beryl+8H2O+10chrysoberyl+8muscovite+166K-feldspar+beryl+6H2O+8Al2O3→3+6muscovite+6Contactandregional cercer 較大（3.7g/cm3），常常和重砂以及錫 (Danieletal., cercerLavradeHematitaTheMalacachetaTheAmericanaandSantanaTwolayers(upperandthelowercascalholayer)ofstratigraphy(7distinctivelayers)havegem-bearingchrysoberyl cerDeposis-BarroPretocerDeposis-BarroPretoinSantanaiscomposedofgempebblesinterlayeredwithinthesandandroundedrocks(limitedtransportdistances)ThelowercascalhoComprisesgraniticriverrocks,quartzgravel,sandandgemmaterial(thegemmaterialrecoveredshowsfewersignsoftransport)

Beryl+4K-feldspar+4H+Beryl+4K-feldspar+4H+→3chrysoberyl+18quartz6K-feldspar+beryl+6H2O+8Al2O3→3chrysoberyl+6muscovite+6中。由于風(fēng)化作用，礦囊中許多礦物都遭到溶蝕，長(zhǎng)變石質(zhì)量也很好（重量小于3ct），使巴西成為貓眼石和變?cè)搮^(qū)含寶石偉晶巖形成于