Gemmological and Mineralogical Characteristics of Nephrite from Luodian, Guizhou Province
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摘要: 近期，中国贵州省罗甸县发现了一种新的软玉矿。为了验证贵州罗甸软玉的矿物组成，采用ICPMS，XRD及FTIR等测试仪器对该软玉样品进行了测试与研究。结果表明，贵州罗甸软玉主要由透闪石组成，含少量的方解石细脉及燧石团块；其折射率、密度与标准的透闪石接近，但普遍略低于新疆和田玉的。为了进一步评估贵州罗甸软玉的质地，运用SEM观测其显微结构，揭示其透闪石主要呈纤维状、柱状和片状变晶结构，晶粒（片）粒度小，结构细腻，具有较好的加工性能。XRD慢速扫描结果显示，贵州罗甸软玉中透闪石矿物的结晶度相对较高，推测可能与其相对稳定的结晶环境有关。Abstract: A new kind of nephrite deposit has been discovered in Luodian County，Guizhou Province recently.In order to verify the mineral components of the nephrite from Luodian，Guizhou Province，this paper investigates this kind of nephrite samples by using the ICPMS，XRD and FTIR.The results show that the nephrite from Luodian，Guizhou Province is mainly composed of tremolite with minor calcite veins and glaebule chert.The refractive index and density of the nephrite samples，quite close to those of the standard tremolite，are generally lower than those of the nephrite from Hetian，Xinjiang.Based on the SEM observation，the tremolite in the nephrite samples from Luodian，Guizhou Province has fibrous texture，columnar texture and sheet－like texture.The characteristics of fine grains and compact structure make the nephrite samples have good process properties.The result of XRD slow scanning shows that the crystallinity of the tremolite in the nephrite samples from Luodian，Guizhou Province is comparatively high，which are probably related with a stable crystalline environment.
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Keywords:
- nephrite /
- tremolite /
- Luodian /
- Guizhou Province
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[1] 唐延龄,刘德权,周汝洪.和田玉的名称、文化、玉质和矿床类型之探讨[J].岩石矿物学杂志,2002,21(增刊):13-21. [2] 周征宇.东昆仑三岔口软玉(透闪石玉)成矿构造背景及成矿机制研究[D].上海:同济大学,2006. [3] 王时麒,段体玉,郑姿姿.岫岩软玉(透闪石玉)的矿物岩石学特征及成矿模式[J].岩石矿物学杂志,2002,21(增刊):79-90. [4] 陈盈.江苏溧阳软玉的岩石矿物学研究[D].上海:同济大学,2008. [5] 汤德平,林国新,江爱耕,等.福建首次发现软玉[J].高校地质学报,1997,3(4):396-399. [6] 王春云.龙溪软玉的矿物学研究[J].地质地球化学,1993,7(3):201-205. [7] 许佳君.新疆软玉的谱学研究[D].上海:同济大学,2008. [8] 李昌年.微量元素及其在岩石学中的应用[M].武汉:武汉地质学院岩石教研室,1983.31-36. [9] 周振华,冯佳睿.新疆软玉、岫岩软玉的岩石矿物学对比研究[J].岩石矿物学杂志,2010,29(3):331-340. [10] JCPDS.Mineral powder diffraction file[M].Swarthmore,U.S.A:International Centre for Diffraction Data.1986.
[11] Klug,Harold P,Alexander,Leroy E.X-ray diffraction procedures for polycrystalline and amorphous materials[M].New York:Wiley and Sons,1974.966.
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