Identification Characteristic of "Recrystallized Snythetic Emerald"

L. Lei, Shen Andy Hsitien
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Abstract

Recently, a kind of "recrystallized emerald" that claims to be created from natural emerald powder appeared in the market. In order to figure out its identification characteristics, on the basis of conventional gemmological testing, several other testing instruments were used, such as laser ablation inductively coupled plasma mass spectrometry, Fourier transform infrared spectrometer, ultraviolet visible spectrophotometer, and laser Raman spectrometer. The gemmological characteristics, chemical compositions and spectroscopy characteristics of 6 "recrystallized emerald" samples were tested. The inclusions of the samples include water-ripple pattern, gas-liquid two-phase inclusion, and healed cracks. The chemical composition of the sample is w(Al2O3)=18.48%~18.79%, w(SiO2)= 65.93%~66.19%, and w(Be)=49 700×10-6~50 700×10-6. The trace elements are rich in V and poor in Fe. The infrared spectra of the samples showed absorption peaks at 2 326, 5 102, 5 272, 5 456, 6 817, 7 143 cm-1 and a wide absorption band in the range of 4 000~3 400 cm-1, which indicates that the samples contain both type Ⅰ water and type Ⅱ water. The UV-Vis spectra of the samples showed absorption of Cr3+, Fe3+ and V3+in one category, and absorption of Cr3+ and V3+ in the other. Raman spectra of the samples showed the Be-O telescopic vibration (1 067 cm-1), deformation vibration of Si-O-Si (683 cm-1) and lattice vibration (321.5 cm-1). The results showed that the characteristics of the "recrystallized emeralds" accord with the characteristics of hydrothermal synthetic emeralds, and no evidence indicates natural genesis. The so-called "recrystallized emerald" is more a gimmick for businesses to attract customers. The "recrystallized emerald" should be correctly named as synthetic emerald.
“再结晶合成祖母绿”的鉴定特征
最近,市场上出现了一种声称由天然祖母绿粉末制成的“再结晶祖母绿”。为了明确其鉴别特性,在常规宝石学检测的基础上,采用了激光烧蚀电感耦合等离子体质谱仪、傅里叶变换红外光谱仪、紫外可见分光光度计、激光拉曼光谱仪等多种检测仪器。对6个“再结晶祖母绿”样品的宝石学特征、化学成分和光谱特征进行了测试。样品的包裹体主要有水波纹型、气液两相包裹体和愈合裂纹。样品的化学成分为w(Al2O3)=18.48%~18.79%, w(SiO2)= 65.93%~66.19%, w(Be)=49 700×10-6~50 700×10-6。微量元素富V,贫Fe。红外光谱显示,样品在2 326、5 102、5 272、5 4556、6 817、7 143 cm-1处有较宽的吸收峰,在4 000~3 400 cm-1范围内,表明样品中既有Ⅰ型水,也有Ⅱ型水。样品的紫外可见光谱显示,一类吸收Cr3+、Fe3+和V3+,另一类吸收Cr3+和V3+。样品的拉曼光谱表现为Be-O伸缩振动(1 067 cm-1)、Si-O-Si变形振动(683 cm-1)和晶格振动(321.5 cm-1)。结果表明,“重结晶祖母绿”的特征符合热液合成祖母绿的特征,没有自然成因的迹象。所谓的“再结晶祖母绿”更多的是商家吸引顾客的噱头。“再结晶祖母绿”应正确命名为合成祖母绿。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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