宝石5-7(碧玺、锆石、橄榄)-课件(PPT讲稿).ppt

第七节第七节碧碧玺玺?碧玺的命名: 碧玺的矿物名称叫电气石( Tourmaline )。电气石的英文名来源不清,一般认为源于斯里兰卡僧伽罗语 turmali , 这曾是当地宝石商用于黄色锆石的名称。它被用于电气石,据说是因为 1703 年有人将一包电气石误标为黄色锆石并送到荷兰首都阿姆斯特丹的宝石商那里。从此以后, 电气石就用上了这个名字。早在 18世纪初,斯里兰卡的碧玺被送往欧洲的途中,人们发现碧玺经日晒后能吸引灰尘和草屑,故有“吸灰石”之称。?碧玺---10 月生辰石之一,象征安乐。 A pink tourmaline and diamond A pink tourmaline and diamond pendent necklace pendent necklace () () HK$: 168 000 – 192 000 US$: 21 000 – 24 000 The near fiawless material of an even strong pink colour and glass - like translucency, well carved as a cluster of pomegranates enveloped by gnarled leafy branches, with a spider clambering up on one side, suspended from a diamond - set fancy - link neckchain , pendant 19 th century, necklace circa 1920, . Pendant x . 碧玺的碧玺的基本特征基本特征?碧玺属于硅酸盐矿物,是化学成份最复杂的宝石之一。?分子式为:( Na , Ca )( Mg , Fe, Mn , Li, Al) 3 Al 6 [Si 6O 18 ][BO 3] 3( OH ,F) 4碧玺的基本特征碧玺的基本特征?颜色:色彩丰富,可呈现各种各样的颜色,有时同一晶体有几种颜色。?断口:贝壳状?透明度:透明至半透明?光泽:玻璃光泽?硬度:摩氏 7~ ?密度: ~ ?折射率: ~ ?色散性:低, ?包裹体:绿色碧玺包裹体非常小,其它颜色的碧玺含有明显的液相包裹体。如大量的管状包裹体平等排列, 则可加工成碧玺猫眼。?双色碧玺 Red tourmaline Red tourmaline blue tourmaline blue tourmaline ?新疆碧玺 blue tourmaline blue tourmaline Green tourmaline 碧玺的晶体特征碧玺的晶体特征?显著特征:多色性和热电性?晶系:属三方晶系, ?晶形:晶体呈柱状。?晶纹:柱面有纵向晶纹,晶体横断面呈球面三角形。?解理:无解理 An impressive pink tourmaline An impressive pink tourmaline and diamond pendant and diamond pendant (No. 1566) (No. 1566) HK$: 100 000 – 150 000 US$: 12 000 – 18 000 The unusually large pendant of an even brilliant pink colour , modelled as a peach, framed by a textured gold vine to the twig extending diamond -set and textured white gold leaves, with circular-cut diamond accents to one side and a bicoloured gold bat with diamond-set eyes to the reverse. Tourmaline x