坦桑尼亚Merelani山萤光粗红石榴石变种沙长石的矿物学特征

IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Physics and Chemistry of Minerals Pub Date : 2023-02-16 DOI:10.1007/s00269-023-01233-w
Alfredo Idini, Celestino Angeli, Franco Frau, Guido Ennas, Stefano Naitza, Giovanni Battista De Giudici, Roberto Argazzi
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摘要

Tsavorite是一种绿色的钒铬金属榴石的商品名称,产于Merelani Hills(坦桑尼亚)和Tsavo Park(肯尼亚)地区的前寒武纪地形,是迄今为止用于高级珠宝的Tsavorite宝石级标本的最重要来源。在普通便携式紫外灯照射下,来自Merelani山的沙弗石晶体呈现出粉红色、红色和黄色的荧光,这在石榴石群成员中是一种不寻常的现象。根据衍射数据计算出的电子密度图,并根据总体标准绘制,表明在Al3+占据的晶体位置上明显存在过量的负电荷。体元素分析表明,除粗晶外,最具代表性的端元是含钒金榴石石榴石(3.82 ~ 4.08 mol %)。408 nm激发光束的荧光测量显示出复杂的发射模式,在701和716 nm处发射最强烈,其次是在592 nm处。在592 nm处的黄色波段占主导地位,而红色波段的贡献调节了从亮橙色到粉红色的颜色范围。592 nm处的发射归因与Mn2+有关,而701和716 nm处的发射可能与铬含量和/或钒作为V2+的可能部分有关。由于在紫外光下感知到的特征颜色,使用普通的led灯可以作为一种有用的诊断工具来轻松识别沙沃莱特。
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Mineralogical characterization of fluorescent grossular garnet var. tsavorite from Merelani Hills, Tanzania

Tsavorite is the trade name for the green vanadium–chromium variety of grossular occurring in the Precambrian terrains in the areas of Merelani Hills (Tanzania) and Tsavo Park (Kenya) which are by far the most important source of gem grade specimens of tsavorite used for high jewellery. The tsavorite crystals from Merelani Hills exhibit a pink-red and yellow fluorescence when irradiated by common portable UV lamp, an unusual phenomenon among members of the garnet group. The electron density map calculated from the diffraction data and plotted against a grossular standard shows that an excess of negative charge is clearly pinpointed in the crystallographic site occupied by Al3+. The bulk elemental analysis shows that the most represented end-member, besides grossular, is the vanadium-bearing goldmanite garnet (3.82–4.08 mol %). The fluorometry with an excitation beam at 408 nm indicates a complex emission pattern with the most intense emissions at 701 and 716 nm and subordinately at 592 nm. The colour perception is dominated by the emission yellow band at 592 nm while the contribution of the red band modulates the colour ranging from bright orange to pink-red. The attribution of the emission at 592 nm is related to Mn2+ while the emissions at 701 and 716 nm could be related to the chromium content and/or to a possible fraction of vanadium as V2+. Because of the characteristic colour perceived under UV light, the use of a common led lamp can be useful as a diagnostic tool to easily identify tsavorite.

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来源期刊
Physics and Chemistry of Minerals
Physics and Chemistry of Minerals 地学-材料科学:综合
CiteScore
2.90
自引率
14.30%
发文量
43
审稿时长
3 months
期刊介绍: Physics and Chemistry of Minerals is an international journal devoted to publishing articles and short communications of physical or chemical studies on minerals or solids related to minerals. The aim of the journal is to support competent interdisciplinary work in mineralogy and physics or chemistry. Particular emphasis is placed on applications of modern techniques or new theories and models to interpret atomic structures and physical or chemical properties of minerals. Some subjects of interest are: -Relationships between atomic structure and crystalline state (structures of various states, crystal energies, crystal growth, thermodynamic studies, phase transformations, solid solution, exsolution phenomena, etc.) -General solid state spectroscopy (ultraviolet, visible, infrared, Raman, ESCA, luminescence, X-ray, electron paramagnetic resonance, nuclear magnetic resonance, gamma ray resonance, etc.) -Experimental and theoretical analysis of chemical bonding in minerals (application of crystal field, molecular orbital, band theories, etc.) -Physical properties (magnetic, mechanical, electric, optical, thermodynamic, etc.) -Relations between thermal expansion, compressibility, elastic constants, and fundamental properties of atomic structure, particularly as applied to geophysical problems -Electron microscopy in support of physical and chemical studies -Computational methods in the study of the structure and properties of minerals -Mineral surfaces (experimental methods, structure and properties)
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