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作 者:张学云[1,2] 李加贵[2] 郭继春[2] 任威[2]
机构地区:[1]南京大学金陵学院,江苏南京210089 [2]江苏省质量技术监督南京大学珠宝产品质量检验站,江苏南京210093
出 处:《宝石和宝石学杂志》2016年第A01期30-37,共8页Journal of Gems & Gemmology
摘 要:缅甸琥珀属于矿生琥珀,是世界上最古老的琥珀之一,缅甸琥珀因其成熟度高成为当前琥珀投资收 藏的新热点.收集不同品种缅甸琥珀样品,采用常规宝石学测试手段,结合红外光谱测试技术,对样品的常规 宝石学特征及红外光谱特征进行研究与分析,结果认为表明,缅甸琥珀颜色、内含物及紫外荧光特征具一定产 地指示意义,缅甸琥珀颜色品种丰富,大多数带有褐色调,主要由其内部褐色点状内含物引起.缅甸琥珀大多 在 LW紫外光下具中-强带紫色调的蓝白色荧光,部分样品出现紫白色荧光,样品在 SW紫外光下的荧光强 度弱于在 LW紫外光下的荧光强度,荧光颜色带紫色调可指示缅甸琥珀的产地特征.内部可见圆盘状及点 状褐色点状包体组成的流动纹,方解石和黄铁矿沿根珀或根密的裂隙空洞分布.缅甸琥珀的红外光谱的基本 骨架为脂肪族结构,不同颜色的缅甸琥珀红外光谱有略微差异,表现在2 926,2 867,1 724,1 457,1 377,1 226,1 153,1 026,975 cm^-1附近红外光谱的强弱变化.其中红外光谱中出现975 cm^-1吸收峰,未见891 cm^-1 附近吸收峰,可指示产地特征,同时代表了缅甸琥珀成熟度(即石化程度)高.Ambers from Burma are one of the oldest ambers in the world. Because of the high grade of maturity, those ambers become extremely popular in the market. Different ambers from Burma was chosen as experimental objects. Gemmological characteristics of these sam-ples were identified by conventional methods and infrared spectroscopy. The results showed that the colour, inclusions and UV fluorescence characteristics of samples could implicate or-igin features. Ambers from Burma have various colours and most of them have brown tone causing by punctate brown inclusions. Most ambers had a blue-white fluorescence with a purple tune and a part of samples had a purple white fluorescence. What’s more, samples had a stronger fluorescence under LW-UV than SW-UV. So, the fluorescence with a purple tone could offer some origin information. There were floating lines consisting of discal and punctate brown inclusions in samples with calcite and pyrite distributing along fractures.The ambers with different colours showed slight differences on infrared spectra, which the infrared absorption peaks at 2 926,2 867,1 724,1 457,1 377,1 226,1 153,1 026,975 cm^-1 had different intensities. The appearance of peak at 975 cm^-1 with the absence peak at 891 cm^-1 could indicate the origin feature. And the absence peak at 891 cm^-1 also indicated the high grade of maturity or petrifaction of burmite.
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