云南磷铝石谱学特征研究  

Spectroscopic characteristics of natural variscite from Yunnan

作　　者：魏中枢 狄敬如[1] 

机构地区：[1]中国地质大学(武汉)珠宝学院,湖北武汉430074

出　　处：《岩石矿物学杂志》2018年第1期169-174,共6页Acta Petrologica et Mineralogica

摘　　要：使用电子探针、X射线粉晶衍射仪、傅里叶变换红外光谱仪、激光拉曼光谱仪、紫外可见分光光度计等仪器,对最近在云南发现的一种达到宝石级别的磷铝石进行了化学成分、矿物组成、红外吸收光谱、拉曼光谱、紫外可见吸收光谱等方面的研究。化学成分分析结果表明,该磷铝石的主要化学成分为P和Al,并含有少量的Fe和V;X射线粉晶衍射结果显示,该磷铝石的矿物成分主要为磷铝石,杂质较少;红外光谱与拉曼光谱分析均检出磷酸根基团的特征峰,红外光谱分析还显示有结晶水与结构水的存在;紫外可见吸收光谱在300和420 nm附近的吸收归属于Fe3+,630 nm附近较宽缓的吸收带由Fe3+和V3+共同产生。并将磷铝石与绿松石进行了谱学方面的对比分析,以便更好地区分两者。Recently a new producing area of high-qualiW variscite has been found. The authors used such means as X-ray powder diffraction （XRD）, EPMA analysis, infrared spectrometer, laser Raman spectrometer and ultra-violet-visible spectrophotometry to investigate this natural object. EPMA shows that the variscite in Yun- nan is mainly composed of P and Al, and contains trace Fe and V; XRD shows that the mineral composition is very pure; the infrared spectrum and Raman spectrum show characteristic absorption band of [PO4] group. FTIR also shows the existence of constitution water and crystallization water; UV spectra show that Fe3 ＋ causes the absorption peaks around 300 nm and 420 nm whereas Fe3 ＋ and V3 ＋ cause the wild absorption band around 630 nm. Due to the fact that the variscite is often used as an imitation of turquoise, the authors made a comparative analysis of the spectra of the variscite and turquoise in order to distinguish the two minerals.

关 键 词：磷铝石 X射线粉晶衍射 化学成分 光谱 绿松石 

分 类 号：P578.92[天文地球—矿物学] P575.4[天文地球—地质学]