Calcioancylite-(La), (La,Ca)2(CO3)2(OH,H2O)2, a new member of the ancylite group from Gejiu nepheline syenite, Yunnan Province, China

IF 2.8 3区地球科学 Q2 MINERALOGY

Mineralogical Magazine Pub Date : 2023-04-19 DOI:10.1180/mgm.2023.28

Yanjuan Wang, X. Gu, G. Dong, Z. Hou, F. Nestola, Zhusen Yang, Guang Fan, Yufei Wang, Kai Qu

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Abstract

Abstract Calcioancylite-(La), ideally (La,Ca)2(CO3)2(OH,H2O)2, has been discovered from nepheline syenite of the Gejiu alkaline complex in the Honghe Hani and Yi Autonomous Prefecture, Yunnan Province, China. The mineral occurs as aggregates of subhedral grains, and the size of single crystals varies between 5–20 μm. Calcioancylite-(La) is colourless to pale pinkish grey and has transparent to translucent lustre. It is brittle with a Mohs hardness of 4. The calculated density is 4.324 g/cm3. The mineral is biaxial (−), with α =1.662, β = 1.730, γ = 1.771, 2Vmeas. = 70°(1) and 2Vcalc. = 73°. Electron microprobe analysis for holotype material yielded an empirical formula of (La0.58Ce0.55Pr0.14Nd0.10Ca0.39Sr0.20K0.04)Σ2.00(CO3)2[(OH)1.25F0.06⋅0.69H2O]Σ2.00. Calcioancylite-(La) is orthorhombic, with space group Pmcn, a = 5.0253(3) Å, b = 8.5152(6) Å, c = 7.2717(6) Å, V = 311.17(4) Å3 and Z = 2. By using single-crystal X-ray diffraction, the crystal structure has been determined and refined to a final R1 = 0.0652 on the basis of 347 independent reflections (I > 2σ). The seven strongest powder X-ray diffraction lines [d in Å (I) (hkl)] are: 2.334 (100) (013), 2.970 (80) (121), 4.334 (75) (110), 3.678 (68) (111), 2.517 (55) (200), 2.647 (47) (031) and 2.077 (44) (221). Calcioancylite-(La) is the La-analogue of calcioancylite-(Ce) and is a new member of ancylite-group minerals. The mineral and its name have been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA2021-090).

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钙安云母-(La)， (La,Ca)2(CO3)2(OH,H2O)2，云南个旧霞石正长岩中安云母群的新成员

摘要在云南省红河哈尼族彝族自治州个旧碱性杂岩体的霞石正长岩中发现了钙铝榴石-（La），最好是（La，Ca）2（CO3）2（OH，H2O）2。该矿物以半自形颗粒的聚集体形式出现，单晶的大小在5–20μm之间。钙水杨石-（La）无色至浅粉灰色，具有透明至半透明的光泽。它很脆，莫氏硬度为4。计算出的密度为4.324 g/cm3。矿物为双轴（−），α=1.662，β=1.730，γ=1.771，2Vmeas=70°（1）和2Calc.=73°。正模材料的电子探针分析得出经验公式为（La0.58Ce0.55Pr0.14Nd0.10Ca0.39Sr0.20K0.04）∑2.00（CO3）2[（OH）1.25F0.06·0.69H2O]∑2.00。钙铝酸钙石-（La）是斜方晶系，空间群为Pmcn，a=5.0253（3）Å，b=8.5152（6）Å、c=7.2717（6）å、V=311.117（4）Å3和Z=2。通过单晶X射线衍射，在347次独立反射（I>2σ）的基础上，确定并细化了晶体结构，最终R1=0.0652。七条最强的粉末X射线衍射线[dinÅ（I）（hkl）]分别为：2.334（100）（013）、2.970（80）（121）、4.334（75）（110）、3.678（68）（111）、2.517（55）（200）、2.647（47）（031）和2.077（44）（221）。钙酸钙岩-（La）是钙酸钙石-（Ce）的La类似物，是一种新的方沸石类矿物。该矿物及其名称已获得国际矿物学协会新矿物、命名和分类委员会（IMA2021-090）的批准。

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来源期刊

Mineralogical Magazine 地学-矿物学

CiteScore

4.00

自引率

25.90%

发文量

104

审稿时长

6-12 weeks

期刊介绍： Mineralogical Magazine is an international journal of mineral sciences which covers the fields of mineralogy, crystallography, geochemistry, petrology, environmental geology and economic geology. The journal has been published continuously since the founding of the Mineralogical Society of Great Britain and Ireland in 1876 and is a leading journal in its field.