“非洲翠”石英质玉的宝石学特征及其鉴定

Gemmological Characteristic of Quartzite Jade "Feizhoucui" and Its Identification

  • 摘要: 近年,珠宝市场上新兴的一种名为“非洲翠”的石英质玉品种,产自非洲巴伯顿·玛空瓦山脉,目前对其宝石矿物学特征报道较少。为了探寻该品种与其他石英质玉的不同之处,为其鉴定提供科学依据,本研究团队采集了部分“非洲翠”原石及加工抛光后成品,利用常规宝石学测试、超景深显微镜、偏光显微镜、扫描电子显微镜、电子探针、红外光谱、拉曼光谱、X射线粉末衍射分析及能谱分析等测试手段对“非洲翠”样品进行研究分析。结果显示,该“非洲翠”以α-石英为主要矿物组成,粒状结构,是质地致密的隐晶质-显晶质石英集合体。其中,绿色包裹体主要为云母类矿物,或可能为伊利石;金属包裹体主要为黄铁矿,透明包裹体主要为重晶石。作为新兴的石英质玉品种,“非洲翠”在珠宝市场中具有广阔的发展前景,未来需要进一步完善商贸市场规范,推动“非洲翠”产业的持续健康发展。

     

    Abstract: In recent years, a novel gemstone named "Feizhoucui", originated from the Barberton Makhonjwa Mountains in Africa, has emerged in the jewelry market. To date, there have been limited reports on its gemmological characteristics. To investigate the differences between "Feizhoucui" and other types of quartzite jade and to provide a scientific foundation for its identification, our research team collected both rough material and finished product samples of "Feizhoucui". The gemmological characteristics of the samples were studied using conventional gemmological testing instruments, super-resolution microscope, thin section observation under polarized light microscope, scanning electron microscope(SEM), electron microprobe(EPMA), infrared spectroscopy(FITR), Raman spectroscopy, X-ray powder diffraction(XRD) and energy dispersive spectroscopy(EDS) analysis. The results indicated that "Feizhoucui" is a kind of quartzite jade, with α-quartz as the main mineral component, exhibiting a granular structure and forming a compact aggregate of cryptocrystalline-micrystalline quartz. The green inclusions are mainly mica minerals, possibly illite, while metal inclusions are predominantly pyrite. The transparent inclusions are mainly barite. As an emerging gemstone, "Feizhoucui" has great development prospects in the jewelry market and the norms of the commercial and trade market need to be further improved to promote the sustainable and healthy development of the "Feizhoucui" industry in the future.

     

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