摘要
合浦珍珠其化学成分主要为碳酸钙,其次有少量有机质和吸附水。脱水温度60～90℃,相变温度400～500℃,碳酸钙分解温度878～890℃。主要矿物成分为文石,含少量方解石。具较强的浅蓝浅紫色荧光,密度2.7966g/cm^3,摩氏硬度3.9,折射率1.532～1.6865。颜色多呈白色,属浅色色系。具良好圆度和带彩虹的强珍珠光泽,无瑕或少瑕。
The chemical compositions of the Hepu pearls are mainly calciumcarbonate, supplemented by organic matter and adsorptive water. Thetemperature of dehydration is 60～90℃, the temperature of phase variationranges from 400℃ to 500℃ and the decomposition temperature of CaCO_3is 878～890℃. The major mineral constituents are aragonite with minoramounts of calcite. Hepu pearls possess stronger light-bluish or light-violet fluorescenee, and are 2.7966 g/cm^3 in density, 3.9 in hardness,1.5320～1.6865 in refractive index. In general, Hepu pearls are well-rounded, have an elegant pearly luster, and are flawless or possess a fewof flaws.
关键词
珍珠
养殖
宝石学
广西
marine-cultured pearls
gemology
Guangxi
Hepu
