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.

报告了来自保加利亚 Zvezdel 和希腊 Lavrion 的蛇纹岩样品的结构特征。讨论了来自 Lavrion 的蛇纹石的热行为。研究样品的化学成分通过能量色散光谱 (EDS) 进行分析，并通过单晶结构改进进行确认。得到的化学式与蛇纹石很好地对应，Cu:Zn 比在 2.9 和 5.6 之间变化。来自 Zvezdel 的样品，成分为 Ca[Cu _3.3 Zn _0.7 (OH) ₆ (SO ₄ ) ₂ •3H ₂ O，在单斜晶系中结晶，具有空间群I 2 和晶胞参数a  = 18.418(3) , b = 6.220(1), c  = 12.091(2) Å, β  = 90.78(1)˚，而来自 Lavrion Ca[Cu _2.8 Zn _1.2 (OH) ₆ (SO ₄ ) ₂ ]•3H ₂ O 的结果相似晶胞参数a  = 18.394(1), b  = 6.256(1), c  = 12.097(1) Å, β  = 90.92(1)˚, 但更高的I 2 /m空间群对称性。两种研究的晶体都表现出蛇纹石结构拓扑结构，但八面体层的堆叠顺序不同。虽然在之前研究的 Sabelli 和 Zanazzi 蛇纹岩（Acta Cryst B24:1214-1221, 1968）中每个晶胞有两层，但在目前研究的样品中只有一层。因此，它们的晶胞体积是具有 SG C 2/ c和晶胞参数a  = 22.186(2), b  = 6.250(2), c  = 21.853(2 ) 的第一个结构特征的蛇纹岩样品的一半) Å, β  = 113.36(1)˚。考虑到所研究样品的结构特性，它们被认为是蛇纹石多型体。