Li Yan, Feng Yilei, Du Jingfen, Wang Yamei, Shi Guanghai, Liang Youzhi
Gemological Institute, China University of Geoscience, Wuhan, 430074, China.
Hubei Engineering Research Center of Jewelry, Wuhan, 430074, China.
Heliyon. 2024 Jul 31;10(16):e35066. doi: 10.1016/j.heliyon.2024.e35066. eCollection 2024 Aug 30.
Xixia amber from Henan Province in China has undergone a thorough examination utilizing microscopic observation, infrared spectroscopy, and three-dimensional (3D) fluorescence spectroscopy. This systematic analysis has revealed that there are primarily two varieties of Xixia amber: a light-colored type and a dark-colored type. These can be differentiated based on their coloration, infrared spectra, and distinctive fluorescence attributes. Notably, the infrared spectral profile of Xixia amber features a prominent peak at 1023 cm, accompanied by less pronounced peaks at 1088 and 974 cm. These spectral characteristics set it apart from amber originating from the Baltic regions, Myanmar, and Fushun. Further distinction is achieved through 3D fluorescence spectra, where Xixia amber exhibits similarities to Burmese and Fushun ambers. Chemical classification via pyrolysis gas chromatography-mass spectrometry (Py-GC-MS) identifies Xixia amber as belonging to Class Ib, characterized by its ordered structure and the absence of succinic acid. This comprehensive study delineates the coloration, infrared spectral properties, photoluminescent behavior, and chemical compositions of Xixia amber, clearly differentiating it from ambers sourced from other geographical locations.
中国河南的西峡琥珀已经通过显微镜观察、红外光谱和三维(3D)荧光光谱进行了全面检查。这一系统分析表明,西峡琥珀主要有两种类型:浅色型和深色型。可以根据它们的颜色、红外光谱和独特的荧光特性对其进行区分。值得注意的是,西峡琥珀的红外光谱在1023 cm处有一个突出的峰值,在1088和974 cm处有不太明显的峰值。这些光谱特征使其有别于来自波罗的海地区、缅甸和抚顺的琥珀。通过3D荧光光谱进一步区分,西峡琥珀与缅甸琥珀和抚顺琥珀表现出相似性。通过热解气相色谱-质谱联用(Py-GC-MS)进行的化学分类将西峡琥珀鉴定为Ib类,其特点是结构有序且不含琥珀酸。这项综合研究描绘了西峡琥珀的颜色、红外光谱特性、光致发光行为和化学成分,清楚地将其与其他地理位置来源的琥珀区分开来。