Iranite, CuPb10(CrO4)6(SiO4)2(OH) 2, isomorphous with hemihedrite

Hexiong Yang; Jennifer L. Sano; Carla Eichler; Robert T. Downs; Gelu Costin

doi:10.1107/S0108270107053449

Iranite, CuPb₁₀(CrO₄₎₆(SiO₄₎₂(OH) ₂, isomorphous with hemihedrite

Hexiong Yang, Jennifer L. Sano, Carla Eichler, Robert T. Downs, Gelu Costin

Geosciences

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

This study presents the first structural report of iranite, ideally CuPb10(CrO4)6(SiO4)2(OH)2 [copper deca-lead hexa-chromate bis-(orthosilicate) dihydroxide], based on single-crystal X-ray diffraction data. Iranite is isomorphous with hemihedrite, with substitution of Cu for Zn and OH for F. The Cu atom is situated at the special position with site symmetry . The CrO4 and SiO4 tetra-hedra and CuO4(OH)2 octa-hedra form layers that are parallel to (120) and are linked together by five symmetrically independent Pb²⁺ cations displaying a rather wide range of bond distances. The CuO4(OH)2 octa-hedra are corner-linked to two CrO4 and two SiO4 groups, while two additional CrO4 groups are isolated. The mean Cr - O distances for the three nonequivalent CrO4 tetra-hedra are all slightly shorter than the corresponding distances in hemihedrite, whereas the CuO4(OH)2 octa-hedron is more distorted than the ZnO4F2 octa-hedron in hemihedrite in terms of octa-hedral quadratic elongation.

Original language	English (US)
Pages (from-to)	i122-i124
Journal	Acta Crystallographica Section C: Crystal Structure Communications
Volume	63
Issue number	12
DOIs	https://doi.org/10.1107/S0108270107053449
State	Published - Nov 24 2007

ASJC Scopus subject areas

General Biochemistry, Genetics and Molecular Biology

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title = "Iranite, CuPb10(CrO4)6(SiO4)2(OH) 2, isomorphous with hemihedrite",

abstract = "This study presents the first structural report of iranite, ideally CuPb10(CrO4)6(SiO4)2(OH)2 [copper deca-lead hexa-chromate bis-(orthosilicate) dihydroxide], based on single-crystal X-ray diffraction data. Iranite is isomorphous with hemihedrite, with substitution of Cu for Zn and OH for F. The Cu atom is situated at the special position with site symmetry . The CrO4 and SiO4 tetra-hedra and CuO4(OH)2 octa-hedra form layers that are parallel to (120) and are linked together by five symmetrically independent Pb2+ cations displaying a rather wide range of bond distances. The CuO4(OH)2 octa-hedra are corner-linked to two CrO4 and two SiO4 groups, while two additional CrO4 groups are isolated. The mean Cr - O distances for the three nonequivalent CrO4 tetra-hedra are all slightly shorter than the corresponding distances in hemihedrite, whereas the CuO4(OH)2 octa-hedron is more distorted than the ZnO4F2 octa-hedron in hemihedrite in terms of octa-hedral quadratic elongation.",

author = "Hexiong Yang and Sano, \{Jennifer L.\} and Carla Eichler and Downs, \{Robert T.\} and Gelu Costin",

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AU - Yang, Hexiong

AU - Sano, Jennifer L.

AU - Eichler, Carla

AU - Downs, Robert T.

AU - Costin, Gelu

PY - 2007/11/24

Y1 - 2007/11/24

N2 - This study presents the first structural report of iranite, ideally CuPb10(CrO4)6(SiO4)2(OH)2 [copper deca-lead hexa-chromate bis-(orthosilicate) dihydroxide], based on single-crystal X-ray diffraction data. Iranite is isomorphous with hemihedrite, with substitution of Cu for Zn and OH for F. The Cu atom is situated at the special position with site symmetry . The CrO4 and SiO4 tetra-hedra and CuO4(OH)2 octa-hedra form layers that are parallel to (120) and are linked together by five symmetrically independent Pb2+ cations displaying a rather wide range of bond distances. The CuO4(OH)2 octa-hedra are corner-linked to two CrO4 and two SiO4 groups, while two additional CrO4 groups are isolated. The mean Cr - O distances for the three nonequivalent CrO4 tetra-hedra are all slightly shorter than the corresponding distances in hemihedrite, whereas the CuO4(OH)2 octa-hedron is more distorted than the ZnO4F2 octa-hedron in hemihedrite in terms of octa-hedral quadratic elongation.

AB - This study presents the first structural report of iranite, ideally CuPb10(CrO4)6(SiO4)2(OH)2 [copper deca-lead hexa-chromate bis-(orthosilicate) dihydroxide], based on single-crystal X-ray diffraction data. Iranite is isomorphous with hemihedrite, with substitution of Cu for Zn and OH for F. The Cu atom is situated at the special position with site symmetry . The CrO4 and SiO4 tetra-hedra and CuO4(OH)2 octa-hedra form layers that are parallel to (120) and are linked together by five symmetrically independent Pb2+ cations displaying a rather wide range of bond distances. The CuO4(OH)2 octa-hedra are corner-linked to two CrO4 and two SiO4 groups, while two additional CrO4 groups are isolated. The mean Cr - O distances for the three nonequivalent CrO4 tetra-hedra are all slightly shorter than the corresponding distances in hemihedrite, whereas the CuO4(OH)2 octa-hedron is more distorted than the ZnO4F2 octa-hedron in hemihedrite in terms of octa-hedral quadratic elongation.

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Iranite, CuPb₁₀(CrO₄₎₆(SiO₄₎₂(OH) ₂, isomorphous with hemihedrite

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