Serpierite polytypoids from Zvezdel, Bulgaria, and Lavrion, Greece

IF 1.4 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Mineralogy and Petrology Pub Date : 2022-11-07 DOI:10.1007/s00710-022-00797-9

Rositsa P. Nikolova, Nadia L. Petrova, Zlatka G. Delcheva, Liliya V. Tsvetanova, Tsveta Stanimirova, Iskra Piroeva

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Abstract

Structural characteristics of serpierite samples from Zvezdel, Bulgaria, and Lavrion, Greece, are reported. The thermal behaviour of serpierite from Lavrion is discussed. The chemical composition of the studied samples is analysed by energy-dispersive spectroscopy (EDS) and confirmed by single-crystal structure refinements. The obtained chemical formulas correspond well to that of serpierite with Cu:Zn ratio varying between 2.9 and 5.6. The sample from Zvezdel, with composition Ca[Cu_3.3Zn_0.7(OH)₆(SO₄)₂•3H₂O, crystallizes in the monoclinic crystal system, with space group I2 and unit-cell parameters a = 18.418(3), b = 6.220(1), c = 12.091(2) Å, β = 90.78(1)˚, whereas the one from Lavrion Ca[Cu_2.8Zn_1.2(OH)₆(SO₄)₂]•3H₂O, shows similar unit-cell parameters a = 18.394(1), b = 6.256(1), c = 12.097(1) Å, β = 90.92(1)˚, but higher I2/m space-group symmetry. Both studied crystals exhibit serpierite structure topology, but different stacking sequence of the octahedral layers. While in previously studied serpierite of Sabelli and Zanazzi (Acta Cryst B24:1214-1221, 1968) there are two layers per unit cell, in currently studied samples there is only one. As a consequence, their unit-cell volumes are half than that of the first structurally characterized serpierite specimen with SG C2/c and unit-cell parameters a = 22.186(2), b = 6.250(2), c = 21.853(2) Å, β = 113.36(1)˚. Taking into account the structural peculiarities of the studied samples they are considered as serpierite polytypoids.

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保加利亚Zvezdel和希腊Lavrion的Serpierite多型体

报道了保加利亚Zvezdel和希腊Lavrion的绢云母样品的结构特征。讨论了来自Lavrion的绢云母的热行为。用能谱仪(EDS)分析了样品的化学成分，并用单晶结构精化法进行了确证。所得化学式与铜锌比在2.9 ~ 5.6之间变化的绢云母的化学式吻合较好。Zvezdel样品的组成为Ca[Cu3.3Zn0.7(OH)6(SO4)2•3H2O]的单斜晶系具有空间群I2和单位胞参数a = 18.418(3)， b = 6.220(1)， c = 12.091(2) Å， β = 90.78(1)˚，而Lavrion样品的单位胞参数a = 18.394(1)， b = 6.256(1)， c = 12.097(1) Å， β = 90.92(1)˚相似，但I2/m空间群对称性更高。两种晶体均呈现绢云母结构拓扑，但八面体层的堆叠顺序不同。在Sabelli和Zanazzi之前的研究中(ActaCryst B24:1214-1221, 1968)每个单位细胞有两层，而目前研究的样品只有一层。结果表明，它们的单位细胞体积是第一个具有结构特征的绢云母样品的一半，其单位细胞参数为a = 22.186(2)， b = 6.250(2)， c = 21.853(2) Å， β = 113.36(1)˚。考虑到所研究样品的结构特点，它们被认为是绢云母多型体。

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来源期刊

Mineralogy and Petrology 地学-地球化学与地球物理

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

1 months

期刊介绍： Mineralogy and Petrology welcomes manuscripts from the classical fields of mineralogy, igneous and metamorphic petrology, geochemistry, crystallography, as well as their applications in academic experimentation and research, materials science and engineering, for technology, industry, environment, or society. The journal strongly promotes cross-fertilization among Earth-scientific and applied materials-oriented disciplines. Purely descriptive manuscripts on regional topics will not be considered. Mineralogy and Petrology was founded in 1872 by Gustav Tschermak as "Mineralogische und Petrographische Mittheilungen". It is one of Europe''s oldest geoscience journals. Former editors include outstanding names such as Gustav Tschermak, Friedrich Becke, Felix Machatschki, Josef Zemann, and Eugen F. Stumpfl.