Vladimirivanovite Revised: General Crystal Chemistry and Isomorphous Substitutions of Extra-Framework Species

IF 2.2 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Minerals Pub Date : 2024-08-29 DOI:10.3390/min14090883

Nadezhda B. Bolotina, Nikita V. Chukanov, Anatoly N. Sapozhnikov, Natalia V. Zubkova, Igor V. Pekov, Dmitry A. Varlamov, Marina F. Vigasina, Maria O. Bulakh, Vasiliy O. Yapaskurt, Dmitry A. Ksenofontov

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Abstract

New data on the crystal structure, chemical composition, and nature of extra-framework components of the orthorhombic sodalite-group mineral vladimirivanovite were obtained using chemical and single-crystal X-ray diffraction data as well as infrared and Raman spectroscopy. The crystal structure of vladimirivanovite is based on the sodalite-type aluminosilicate framework with ordered Al and Si atoms. Sodalite-like cages are mainly occupied by Na+ and Ca2+ cations and (SO4)2− anions. It was shown that vladimirivanovite is characterized by significant variations in the content of extra-framework polysulfide groups (S3•−, S4), as well as other neutral molecules (H2O and CO2), the presence of which in the structure is the main cause of structural modulations and the orientation disordering of sulfate anions. Three samples with different S3•−:S4 ratios were studied. All of them are orthorhombic (space group Pnaa) with the unit-cell parameters a ≈ 9.1, b ≈ 12.9, and c ≈ 38.6 Å; Z = 6. The general crystal-chemical formula of vladimirivanovite is (Na+6.0–6.4Ca2+1.5–1.7)(Al6Si6O24)(SO42−,S3•−,S4)1.7–1.9(CO2)0–0.1·nH2O (n = 1–3), where the S4 molecule occurs in different conformation states.

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Vladimirivanovite 修订版：一般晶体化学和框架外物种的同构取代

利用化学和单晶 X 射线衍射数据以及红外线和拉曼光谱，获得了有关正长方钠长石族矿物 vladimirivanovite 的晶体结构、化学成分和框架外成分性质的新数据。vladimirivanovite 的晶体结构基于具有有序铝原子和硅原子的钠长石型铝硅酸盐框架。钠长石型笼子主要由 Na+、Ca2+ 阳离子和 (SO4)2- 阴离子占据。研究表明，弗拉基米尔钒钛的特点是框架外多硫化物基团（S3--、S4）以及其他中性分子（H2O 和 CO2）含量的显著变化，这些分子在结构上的存在是结构调整和硫酸根阴离子取向紊乱的主要原因。研究了三种具有不同 S3--:S4 比率的样品。它们都是正方晶（空间群 Pnaa），单位晶胞参数 a ≈ 9.1、b ≈ 12.9 和 c ≈ 38.6 Å；Z = 6。海泡石的一般晶体化学式为 (Na+6.0-6.4Ca2+1.5-1.7)(Al6Si6O24)(SO42-,S3--,S4)1.7-1.9(CO2)0-0.1-nH2O (n = 1-3)，其中 S4 分子以不同的构象状态出现。

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来源期刊

Minerals MINERALOGY-MINING & MINERAL PROCESSING

CiteScore

4.10

自引率

20.00%

发文量

1351

审稿时长

19.04 days

期刊介绍： Minerals (ISSN 2075-163X) is an international open access journal that covers the broad field of mineralogy, economic mineral resources, mineral exploration, innovative mining techniques and advances in mineral processing. It publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.

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