个旧超白霞石正长岩中Bobtrallite的新产状及晶体结构

IF 1.8 3区地球科学 Q2 MINERALOGY

European Journal of Mineralogy Pub Date : 2023-01-31 DOI:10.5194/ejm-35-65-2023

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

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引用次数: 0

摘要

摘要本文报道了个旧霞石正长岩中第二次产出的白榴石。极为罕见和复杂的含硼硅酸锆与钠长石、正长石、翡翠、萤石、钙矾石、钛矿以及其他REE和含锆矿物、钙矾土、莫玄玄玄玄玄岩、låvenite、Eudialite、britholite-（Ce）和钙铝酸钙石-（La）有关。所研究材料的EMP和LA ICP MS分析给出了经验公式：（Na9.70Li0.42K0.08□1.80）∑12.00（Sr10.61Ca1.14Fe0.07□0.18）∑12.00（Zr12.87Ti0.53Nb0.31REE0.08Y0.06U0.02Th0.01□0.12）∑14.00（Si42.41B5.59Al0.02）∑48.02O132（OH）12 ⚫ 12H2O。Bobtrallite是三角的，空间群为P3’c1，a=19.6977（6），c=9.9770（3） Å，V=3352.4（2） Å3，Z=1。单晶结构的细化表明，所有的钠都占据了Na（1）和Na（2）位置；这两个位置的位点占有率分别为0.835（18）和0.15（2），表明Na（1）位点是Na显性位点，而Na（2）是空位显性位点。[8]-配位位点被分配给Sr和Ca，自由占用因子分别为0.874（10）和0.126（10）。这些新的数据表明，方沸石的理想公式可以写成（Na，□)12(□,Na）12Sr12Zr14（Si3O9）10[Si2BO7（OH）2]6 ⚫ 12H2O。

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Bobtraillite from Gejiu hyperagpaitic nepheline syenite, southwestern China: new occurrence and crystal structure

Abstract. A second occurrence of bobtraillite is described from the Gejiu nepheline syenite, southwestern China. The extremely rare and complex boron-bearing zirconium silicate is associated with albite, orthoclase, jadeite, fluorite, andradite, titanite, as well as other REE and zirconium-bearing minerals, catapleiite, moxuanxueite, låvenite, eudialyte, britholite-(Ce), and calcioancylite-(La). The EMP and LA-ICP-MS analyses of the studied material give an empirical formula: (Na9.70Li0.42K0.08□1.80)Σ12.00(Sr10.61Ca1.14Fe0.07□0.18)Σ12.00(Zr12.87Ti0.53Nb0.31REE0.08Y0.06U0.02Th0.01□0.12)Σ14.00(Si42.41B5.59Al0.02)Σ48.02O132(OH)12 ⚫ 12H2O. Bobtraillite is trigonal, with space group P3¯c1, a=19.6977(6), c=9.9770(3) Å, V=3352.4(2) Å3, Z=1. Single-crystal structure refinement revealed that all sodium occupies the Na(1) and Na(2) sites; the site occupancy of these two positions is 0.835(18) and 0.15(2), respectively, suggesting that Na(1) site is Na dominant, while Na(2) is a vacancy-dominant site. The [8]-coordinated site has been assigned to Sr and Ca, with free occupancy factors, 0.874(10) and 0.126(10), respectively. These new data indicate that the ideal formula of bobtraillite could be written as (Na,□)12(□,Na)12Sr12Zr14(Si3O9)10[Si2BO7(OH)2]6 ⚫ 12H2O.

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来源期刊

European Journal of Mineralogy 地学-矿物学

CiteScore

2.80

自引率

9.50%

发文量

审稿时长

6-12 weeks

期刊介绍： EJM was founded to reach a large audience on an international scale and also for achieving closer cooperation of European countries in the publication of scientific results. The founding societies have set themselves the task of publishing a journal of the highest standard open to all scientists performing mineralogical research in the widest sense of the term, all over the world. Contributions will therefore be published primarily in English. EJM publishes original papers, review articles and letters dealing with the mineralogical sciences s.l., primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, but also biomineralogy, environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.