宝玉石学第六章614常见有色宝石.ppt

Sometimes you will hear citrine referred to as topaz quartz, which is incorrect. This name was used in the past in reference to the color, which is sometimes similar to the color of topaz. Since topaz is a separate mineral, this type of name can be confusing and should not be used. However, citrine is considered an alternative to topaz as the birthstone for November. ? * Ancient Legends of Citrine?? Considered the stone of lightheartedness, it is said to add cheerfulness and hope to an unpleasant situation.?? ? Ancient people felt this stone had a cleansing aspect to it, a powerful sedative and relaxant to the body.?? Because of this Citrine was thought to bridge the gaps between mental, emotional and intuitive feelings, thus uniting the personality.???? Later people carried Citrine as a protective talisman.? Citrine was carried as a protection against snake venom and evil thoughts. It was considered an aid to digestion and was said to eliminate toxins from the body.?? Those who wore it were blessed with a clear complexion, radiant skin and a happy disposition.? * 水晶与相似宝石的区别 托帕石、碧玺、绿柱石 水晶与玻璃的区别 天然水晶与合成水晶的识别 颜色分布：若是有色的水晶，如紫晶，天然者颜色常呈条带状不均匀分布，发育120o交角的色带；合成水晶大多色较均匀。 包裹体：天然水晶中常有星点状、云雾状气液包裹体及晶体包裹体；合成水晶中偶尔可见种晶片。 * 紫晶主要来自南美洲的巴西、乌拉圭、玻利维亚、美国、阿根廷、南非、纳米比亚、澳大利亚等。 黄晶的重要产地寥寥无几，仅有巴西和马达加斯加生产有一定数量的优质材料。80年代以来世界市场上大量黄晶是由紫水晶加热处理而成的。 烟晶的主要产地有斯里兰卡、西班牙、瑞士、苏格兰、美国等。 无色水晶可来自世界各地，但是最重要的产地为斯里兰卡、巴西、美国、缅甸和中国（东海）。 * 水晶类宝石售价不很高，属中低档宝石，紫晶售价几-- 十几美元／克拉，黄晶、烟晶售价就更低些。 * The name opal was derived from the Sanskrit Upala and later the Greek derivative Opallios, meaning to see a change of color. Opal is a gemstone that ranges from semi-transparent to opaque. Its body color covers a broad spectrum of colors, but is mostly prized for what is known as play of color, the ability to reflect and refract light into flashes of multiple colors. 欧泊 （Precious Opal） * Historically, opal was considered a lucky charm that brought beauty, success and happiness to its wearer. Scandinav