Lead-Rich Glass Substance in Filled Treated Rubies
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摘要: 以珠宝市场上新近面市的高铅玻璃充填处理红宝石为研究对象,采用常规检测与实验室测试技术(EPMA,UVVIS,LRS)相结合的研究方法,对充填处理红宝石中次生玻璃的化学成分、晶相、空间分布、显微结构及某些谱学特征进行了较深入的研究。测试结果表明,与传统的铝硅酸盐玻璃、磷铝玻璃、硼质钠铝玻璃高温充填处理红宝石的表现特征明显不同,该类充填处理红宝石中次生玻璃的主化学成分w(PbO)为74%~75%,次为w(Al2O3)(13%~14%)及w(SiO2)(11%~12%),结晶程度差,内部通常存在少量晶形完好的针状金红石、磷灰石等结晶矿物包裹体。依据特征的蓝色—蓝绿色异常闪光效应、残存的扁平状气泡以及UVVIS,LRS和EPMA二次电子像及背散射电子像特征,有助于识别这种高铅玻璃充填处理红宝石。分析认为,此类红宝石是在中温加热条件下沿红宝石原裂隙处填入高铅玻璃材料而成。Abstract: The latest developed lead-rich glass-filled rubies, which have recently appeared on gem markets, are researched. By using routine analysis in corporation with the advanced lab analysis techniques such as EPMA, UV-VIS and LRS, the chemical compositions, crystal phase, space distribution, and microstructure as well as spectrum characteristics of secondary glass in such treated rubies are investigated in depth. The results show that the main chemical composition of the glass filler is w(PbO)(74%~75%), followed by w(Al2O3)(13%~14%) and w(SiO2)(11%~12%), and the crystallization is poor. In addition, there are some crystal inclusions such as rutile and apatite that are not altered or dissolved during the treatment, and this has normally been seen in unheated corundum. All these features are quite different from the traditional rubies which are treated by aluminium silicate glass, phosphorus aluminium glass and boron natrium-aluminium glass. Blue to bluish green flash effect, residual flat gas bubbles, UV-VIS, LRS, EPMA backscattered electron image and secondary electron image usually give enough evidence for detection of this latest treatment. The analysis results show that the fissures and cracks in rubies are filled with lead-rich glass at medium temperature.
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Keywords:
- ruby /
- lead-rich glass /
- filling treatment
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