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Structure Refinement of Cs-rich Na-li Beryl and Analysis of Its Typomorphic Characteristics of Configurations

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Acta Geologica Sinica(English Edition) 2007年第1期81卷 61-67页

作者： liU Yan DENG Jun li guowu SHI Guanghai State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083 Key Laboratory of lithosphere Tectonics and lithoprobing Technology of the Ministry of Education China University of Geosciences Beijing 100083 Laboratory of Single-Crystal X-Ray Diffraction China University of Geosciences Beijing 100083

The tabular beryl found in Huya Country, Sichuan Province is a rare and special member among beryls. Chemical analysis reveals that the beryl is a new type of Cs-rich Na-li beryl, and the content of alkalis （li20, Na2O, K2O, Rb2O, Cs2O） is up to 2.41%. The CCD system on the SMART APEX four circle single crystal diffractometer was used in this experiment to determine the structure of the sample accurately. The beryl belongs to the hexagonal system; its space group is P6/mcc. The dimensions of the unit cell are as follows： a = 0.91961（3） nm, c = 0.91969（7） nm, c/a = 1.0000, V= 0.67357 nm3, 7 = 120°, α= 90°, β = 90°. The accurate atomic coordinates of alkali metal ions and other crystallographic parameters are also obtained： Z = 2, the calculated density D = 2.754 g/cm^3 and final R （ I 〉 2 σ （/3）= 0.046 for 5597 reflections. The crystal structure was described by coordination polyhedron. Based on the data gained, a three-dimensional graph of the crystal structure of tabular beryl was made with the ATOMS 6.0 software. The refinement of crystal structure indicates that there are two main reasons for the cause of the tabular configuration：（1） The substitution of Be by li into the tetrahedral framework weakened the stacked six-sided rings [Si6O18]^12- of the tetrahedral Si; （2） Alkalis （mainly Na and Cs） are too large to substitute in four-fold or six-fold coordination within the structure and are accommodated in the vacant channel. The accommodation of these alkalis strengthened the structure of six-sided rings of the tetrahedral Si. And other alkali metal ions and free volatile molecules such as H2O and CO2 occupy variable positions in the channel. The equation of the electrovalence is li＋＋Na＋→Be^2＋. According to structural and compositional differences, the monoclinic crystal of tabular beryl is considered to be a new member of the beryl group. Chemical constraints of the environment, namely, the bulk-rock chemistry and the fluid-phase composition and physical-chemica

关键词： beryl crystal structure tabular crystal typomorphic characteristics

Hydroxycalciopyrochlore, A New Mineral Species from Sichuan, China

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Acta Geologica Sinica(English Edition) 2014年第3期88卷 748-753页

作者： YANG Guangming li guowu XIONG Ming PAN Baoming YAN Chenjie State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Crystal Structure Laboratory China University of Geosciences

Hydroxycalciopyrochlore,ideally （Ca,Na,U,□）2（Nb,Ti）2O6（OH）,cubic,is a new mineral species （IMA2011-026） within the pyrochlore supergroup that was found occurring at the Maoniuping mine,Mianning County,Xichang prefecture,Sichuan Province,southwest *** mineral is found in an alkali feldspar granite rare-earth ore deposit （26-27 Ma）.Associated minerals include calcite,barite,celestine,albite,aegirine,aegirine-augite,fluorite,parasite-（Ce）,thorite,thorianite,zircon,galena,sphalerite,magnetite,and *** occur mostly as octahedra,and less often as dodecahedra and tetrahexahedra or combinations *** occur with an allotriomorphic habit with a thick triangular tabular *** generally range from 0.1 to 1 mm in *** mineral is brownishblack,greenish-black and black on fresh sections with a brown *** crystal is translucent,and has a greasy lustre on fresh *** is metamict without any observed parting or cleavage and with a conchoidal *** Vickers microhardness is 572 kg/mm2 （5-6 on the Mohs hardness scale）.The density measured by hydrostatic weighing is 5.10（3） g/*** strongest four reflections in the X-ray powder-diffraction pattern [d in（A）（Ⅰ） hkl] are：2.9657 （100） 2 2 2,1.8142 （34） 0 4 4,1.5463 （21） 2 2 6,2.5688 （18） 0 0 *** unit-cell parameters are a =10.381（4）（A）,V=1118.7（7）（A）3,Z =*** structure was solved and refined in the space group Fd3m with R =*** empirical formula is （Ca0.74Na0.5sU0.40Ce0.05Fe0.02□0.21）2.00（Nb1.15Ti0.s0Ta0.03Al0.01Mg0.01）2.00O6.02 [（OH）1.01F0.09]1.10,on the basis of 2 atoms of B pfu; the simplified formula is （Ca,Na,U,□）2（Nb,Ti）2O6（OH）.Type material is deposited in the Geological Museum of China,Beijing,People＇s Republic of China,catalogue number M11800.

关键词： Mineralogy Hydroxycalciopyrochlore pyrochlore supergroup crystal structure Sichuanprovince

白云鄂博矿区矿石中磁铁矿及萤石的X射线粉晶衍射半定量分析方法及矿物三维空间分布模型

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西北地质 2024年第4期57卷 113-120页

作者：孙宁岳闫国英李国武王昭静申俊峰徐渴鑫孟文祥李凤坤中国地质大学(北京)科学研究院晶体结构实验室北京100083 包头钢铁(集团)有限责任公司矿山研究院(有限责任公司) 内蒙古包头014010 中国地质大学(北京)地球科学与资源学院成因矿物学研究中心北京100083

白云鄂博超大型铁-稀土-铌矿床,伴生大量萤石等资源。现阶段,矿山资源评价采用的是多元素定量分析方法,该方法存在不能客观的表征出可用资源的矿物组成和赋存状态的缺陷。为了较为准确地确定元素赋存形式及磁铁矿、萤石矿物含量,本研究... 详细信息

白云鄂博超大型铁-稀土-铌矿床,伴生大量萤石等资源。现阶段,矿山资源评价采用的是多元素定量分析方法,该方法存在不能客观的表征出可用资源的矿物组成和赋存状态的缺陷。为了较为准确地确定元素赋存形式及磁铁矿、萤石矿物含量,本研究选用粉晶X射线衍射K值法定量分析法,通过以白云鄂博白云石为参比物质分别调配1∶1比例产自白云鄂博的磁铁矿、萤石与白云石单矿物样品,获得以白云石为参比的磁铁矿参比强度K_(Fe3O4)^(1)=0.61、萤石参比强度K_(CaF2)^(1)=2.51,同时,精选了白云鄂博其他常见共生矿物的K值,以实现对白云鄂博不同矿石类型中矿物含量的半定量分析,通过测试已知标样验证了改进优化K值的正确性和适用性。利用大量实际岩心矿石样品矿物定量分析数据,通过克里金插值法获得白云鄂博主矿磁铁矿和萤石矿物的空间分布三维模型,初步呈现了资源矿物的空间分布特征,推测在矿区深部仍存在巨大的找矿潜力。X射线粉晶衍射定量分析技术直接对可回收资源的矿物半定量分析研究,为矿山精准分采和资源综合利用探索了新的解决思路,也为选矿流程的优化提供的重要的技术参考。

关键词：白云鄂博磁铁矿萤石 X射线粉晶衍射矿物组分半定量分析

Naquite, FeSi, a New Mineral Species from Luobusha, Tibet, Western China

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Acta Geologica Sinica(English Edition) 2012年第3期86卷 533-538页

作者： SHI Nlcheng BAI Wenji li guowu XIONG Ming YANG Jingsu MA Zhesheng RONG He Crystal Structure Laboratory China University ofGeosciencesBeijing 100083China Institute of Geology CAGSBeijing 100037China

A new mineral species, named naquite（FeSi）, is found in the podiform chromitites of the Luobusha ophiolite in Qusong County, Tibet, China. The detailed composition is Fe 65.65, Si 32.57 and Al 1.78 wt%. The mineral is cubic, space group P213. The irregular crystals range from 15 to 50 μm in diameter and form an intergrowth with luobusaite. Naquite is steel grey in color, opaque, with a metallic lustre and gives a grayish-black streak. The mineral is brittle, has a conchoidal fracture and no apparent cleavage. The estimated Mohs hardness is 6.5, and the calculated density is 6.128 g/cm3. Unit-cell parameters are a 4.486 （4） A, V 90.28 （6）A^3, Z=4. The five strongest powder diffraction lines [d inA（hkl）（I/I0）] are： 3.1742 （110）（40）, 2.5917（111）（43）, 2.0076 （210）（100）, 1.8307 （211）（65）, and 1.1990 （321）（36）. Originally called ＇fersilicite＇, the species and new name have now been approved by the CNMNC （IMA 2010-010）.

关键词： new mineral fersilicite chromite Luobusha ophiolite Tibet

Taipingite-(Ce),(Ce73+,Ca2)∑9Mg(SiO4)3[SiO3(OH)]4F3,a new mineral from the Taipingzhen REE deposit,North Qinling Orogen,central China

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Geoscience Frontiers 2020年第6期11卷 2339-2346页

作者： Kai Qu Xianzhang Sima Guang Fan guowu li Ganfu Shen Huakai Chen Xing liu Qingqing Yin Ting li Yanjuan Wang Tianjin Center China Geological SurveyTianjin 300170China Beijing Research Institute of Uranium Geology Beijing 100029China China University of Geosciences(Beijing) Beijing 100083China Chengdu Center China Geological SurveyChengdu 610081China Henan Nuclear Geological Bureau Zhengzhou 450044China

A new cerite group mineral species,taipingite-(Ce),ideally(Ce7^3+,Ca2)∑9Mg(SiO4)3[SiO3(OH)]4 F3,has been found in the Taipingzhen rare earth element(REE)deposit in the North Qinling Orogen(NQO),Central *** forms subhedral grains(up to approximately 100 μm×200 μm)commonly intergrown with the REE mineral assemblages and is closely associated with allanite-(Ce),gatelite-(Ce),tornebohmite-(Ce),fluocerite-(Ce),fluocerite-(La),fluorite,bastnasite-(Ce),parisite-(Ce)and ***-(Ce)is light red to pinkish brown under a binocular microscope and pale brown to colorless in thin section,and it is translucent to transparent with a grayish-white streak and vitreous *** mineral is brittle with conchoidal fracture;has a Mohs hardness value of approximately 51/2 and exhibits no cleavage twinning or *** calculated density is 4.900(5)g/***,taipingite-(Ce)is uniaxial(+),withω=1.808(5),ε=1.812(7),c=ε,and a=b=ω.Furthermore,this mineral is insoluble in HCl,HNO3 and H2 *** microprobe analysis demonstrated that the sample was relatively pure,yielding the empirical formula(with calculated H2 O):(Ce4.02La1.64Nd1.49Pr0.41Sm0.10Gd0.02Ho0.02Tm0.01Lu0.02Y0.03Ca0.66Mg0.05Th(0.01-0.51∑9(Mg0.75Fe0.253+)∑1(SiO4)3{[SiO3(OH)]3.98[PO3(OH)]0.02}∑4(F1.81OH1.17Cl0.02∑***-(Ce)is trigonal and exhibits space group symmetry R3 c with unit cell parameters a=10.7246(3)Å,c=37.9528(14)Å,V=3780.39(20)Å3 and Z=*** strongest eight lines in the X-ray diffraction pattern are[d in A(I)(hkl)]:4.518(50)(202),3.455(95)(122),3.297(85)(214),3.098(35)(300),2.941(100)(02,10),2.683(65)(220),1.945(40)(238)and 1.754(40)(30,18).The crystal structure has been refined to a R1 factor of 0.025,calculated for the 2312 unique observed reflections(Fo≥4σ).The mineral is named after its discovery locality and is characterized as the F-dominant analogue of cerite-(Ce).

关键词： Taipingite-(Ce) Cerite group New mineral species Chemical composition Crystal structure North Qinling Orogen

Titanium, Ti, A New Mineral Species from Luobusha, Tibet, China

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Acta Geologica Sinica(English Edition) 2013年第5期87卷 1275-1280页

作者： FANG Qingsong BAI Wenji YANG Jingsu RONG He SHI Nicheng li guowu XIONG Ming MA Zhesheng Institute of Geology CAGS X-ray Diffraction Laboratory China University of Geosciences

We describe the new mineral species titanium, ideally Ti, found in the podiform chromitites of the Luobusha ophiolite in Tibet, People＇s Republic of China. The irregular crystals range from 0.1 to 0.6 mm in diameter and form an intergrowth with coesite and kyanite. Titanium is silver grey in colour, the luster is metallic, it is opaque, the streak is grayish black, and it is non-fluorescent. The mineral is malleable, has a rough to hackly fracture and has no apparent cleavage. The estimated Mohs hardness is 4, and the calculated density is 4.503 g/cm3. The composition is Ti 99.23-100.00 wt%. The mineral is hexagonal, space group P6flmmc. Unit-cell parameters are a 2.950 （2） ~, c 4.686 （1） A,V 35.32 （5） A3, Z = 2. The five strongest powder diffraction lines [d in A （hkl）（I/I0）] are： 2.569 （010）（32）, 2.254（011）（100）, 1.730 （012）（16）, 1.478 （110）（21）, and 0.9464 （121）（8）. The species and name were approved by the CNMNC （IMA 2010-044）.

关键词： Titanium new mineral species Ti chromitite Luobusha ophiolite Tibet

Luobusaite:A New Mineral

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Acta Geologica Sinica(English Edition) 2006年第5期80卷 656-659页

作者： BAI Wenji SHI Nicheng FANG Qingsong li guowu XIONG Ming YANG Jingsui RONG He Institute of Geology Chinese Academy of Geological Sciences Baiwanzhang Road 26 Beijing 100037 X-ray Laboratory China University of Geosciences （Beijing） Xueyuan Road 29 Beijing 100083

A group of mantle minerals including about 70-80 subtypes of minerals are discovered from a podiform chromitite in Tibet, China. Recovered minerals include diamond, coesite, moissanite, wustite, Fe-silides and a new mineral, luobusaite. All of these minerals were hand-picked from heavymineral separates of the podiform chromitite in the mantle peridotite of an ophiolite. The grains of luobusaite are as host mineral with inclusions of native silicon or as an intergrowth with native silicon and Fe-Si phase. Luobusaite occurs as irregular grains, with 0.1-0.2 mm in size, consisting of very finegrained aggregates. The mineral is steel-grey in color, metallic luster, and opaque. The empirical formula （based on 2 for Si） is Fe0.83Si2, according to the chemical compositions of luobusaite. X-ray powder-diffraction data： orthorhombic system, space group Cmca, a = 9.874 （14） A, b = 7.784 （5） A, c= 7.829（7） A, Z=16.

关键词： new mineral luobusaite chromitite ophiolite Tibet

Yarlongite:A New Metallic Carbide Mineral

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Acta Geologica Sinica(English Edition) 2009年第1期83卷 52-56页

作者： SHI Nicheng BAI Wenji li guowu XIONG Ming FANG Qingsong YANG Jingsui MA Zhesheng RONG He X-ray Laboratory China University ofGeosciences Beijing 100083 China Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China

Yarlongite occurs in ophiolitic chromitite at the Luobusha mine （29°5′N 92°5′E, about 200 km ESE of Lhasa）, Qusum County, Shannan Prefecture, Tibet Autonomous Region, People＇s Republic of China. Associated minerals are： diamond, moissanite, wiistite, iridium （＂osmiridium＂）, osmium （＂iridosmine＂）, periclase, chromite, native iron, native nickel, native chromium, forsterite, Cr-rich diopside, intermetallic compounds Ni-Fe-Cr, Ni-Cr, Cr-C, etc. Yarlongite and its associated minerals were handpicked from a large heavy mineral sample of chromitite. The metallic carbides associated with yarlongite are cohenite, tongbaite, khamrabaevite and qusongite （IMA2007-034）. Yarlongite occurs as irregular grains, with a size between 0.02 and 0.06 mm, steel-grey colour, H Mohs： 5^1/2-6. Tenacity： brittle. Cleavage：（0 0 1） perfect. Fracture： conchoidal. Chemical formula：（Cr4Fe4Ni）29C4, or （Cr,Fe,Ni）29C4, Crystal system： Hexagonal, Space Group： P63/mc, a = 18.839（2） A, c = 4.4960 （9） A, V = 745.7（2） A^3, Z = 6, Density （calc.） = 7.19 g/cm3 （with simplified formula）. Yariongite has been approved as a new mineral by the CNMNC （IMA2007-035）. Holotype material is deposited at the Geological Museum of China （No. Ml1650）.

关键词： yarlongite new mineral metallic carbides ophiolite luobusha Tibet

A New Three-Dimensional Superstructure in Bafertisite

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Acta Geologica Sinica(English Edition) 2011年第5期85卷 1028-1035页

作者： li guowu~*,XIONG Ming,SHI Nicheng and MA Zhesheng Crystal structure laboratory,National Laboratory of Mineral Materials,China University of Geosciences (Beijing),Beijing 100083,China Crystal structure laboratory National Laboratory of Mineral Materials China University of Geosciences (Beijing) Beijing 100083 China

A new superstructure was found in bafertisite[(Ba;Na;);(Fe;Mn;Mg;);TiO [(Si;Ti;Al;Cr;);O;](OH;F;Cl;);]from Donghai County,Jiangsu Province,*** occurrence of the superstructure reflections were observed by single crystal diffraction using a SMAR APEX *** a;,b;and c;axis directions revealed extra weak reflection spots of the *** apparent 2a,2b and 2c superstructure is monoclinic with unit cell a=10.6502（15） A,b= 13.7233（19）A,c=21.6897（3）A,α=90°,β=94.698（3）°,γ=90°,space group Cm,Z=*** c;extra weak reflections are ignored,the secondary supercell gave a cell a=10.6548（15）A,b=13.7284（19）A,c = 11.6900（17）A,α=90°,β=112.322（28）°,γ=90°,space group Cm,Z=*** basic subcell was obtained by ignoring all extra weak reflection spots and gave:a=5.3249（17）A,b=6.8669（22）A,c=10.8709（36） A,α=90°,β=94.740（62）°,γ=90°,space P2;/m,Z=*** superstructure has been refined to R = 0.063 for 7805[R;= 0.0266]unique reflections I>2δ（I）.The structure consists of an octahedra（O） sheet sandwiched between two heteropolyhedral（H） *** sheets consist of Ti-octahedra and twin tetrahedral disilicate groups[Si;O;].The O sheet comprises（Fe,Mg）O;*** large Ba cation is located in the interlayer *** refined structure shows Fe,Mg are partly *** shifting of the TiO;octahedron and SiO;tetrahedron sites in the sheet may be a consequence of the superstructure.

关键词： bafertisite superstructure crystal structure layered titanium silicate