Letter: The crystal structure of bartelkeite, with a revised chemical formula, PbFeGe VI(Ge 2 IVO 7) (OH) 2·H 2O, isotypic with high-pressure P2 1/m lawsonite

Marcus J. Origlieri, Hexiong Yang, Robert T Downs, Esther S. Posner, Kenneth J. Domanik, William W. Pinch

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Bartelkeite from Tsumeb, Namibia, was originally described by Keller et al. (1981) with the chemical formula PbFeGe 3O 8. By means of electron microprobe analysis, single-crystal X-ray diffraction, and Raman spectroscopy, we examined this mineral from the type locality. Our results show that bartelkeite is monoclinic with space group P2 1/m, unit-cell parameters a = 5.8279(2), b = 13.6150(4), c = 6.3097 (2) Å, β = 127.314(2)°, and a revised ideal chemical formula PbFeGe VIGe 2 IVO 7(OH) 2·H 2O (Z = 2). Most remarkably, bartelkeite is isostructural with the high-pressure P2 1/m phase of lawsonite, CaAl 2Si 2O 7(OH)·H 2O, which is only stable above 8.6 GPa and a potential host for H 2O in subducting slabs. Its structure consists of single chains of edge-sharing FeO 6 and Ge1O 6 octahedra parallel to the c-axis, cross-linked by Ge2 2O 7 tetrahedral dimers. The average <Ge-O> bond lengths for the GeO 6 and GeO 4 polyhedra are 1.889 and 1.744 Å, respectively. The Pb atoms and H 2O groups occupy large cavities within the framework. The hydrogen bonding scheme in bartelkeite is similar to that in lawsonite. Bartelkeite represents the first known mineral containing both 4- and 6-coordinated Ge atoms and may serve as an excellent analog for further exploration of the temperature-pressure-composition space of lawsonite.

Original languageEnglish (US)
Pages (from-to)1812-1815
Number of pages4
JournalAmerican Mineralogist
Volume97
Issue number10
DOIs
StatePublished - Oct 2012

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lawsonite
crystal structure
Minerals
Crystal structure
minerals
Namibia
Atoms
Bond length
Electron probe microanalysis
polyhedrons
Dimers
atoms
Raman spectroscopy
Hydrogen bonds
slabs
dimers
Single crystals
type locality
mineral
analogs

Keywords

  • Bartelkeite
  • Crystal structure
  • Germanate
  • Hydrous mineral
  • Raman spectra
  • X-ray diffraction

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Letter : The crystal structure of bartelkeite, with a revised chemical formula, PbFeGe VI(Ge 2 IVO 7) (OH) 2·H 2O, isotypic with high-pressure P2 1/m lawsonite. / Origlieri, Marcus J.; Yang, Hexiong; Downs, Robert T; Posner, Esther S.; Domanik, Kenneth J.; Pinch, William W.

In: American Mineralogist, Vol. 97, No. 10, 10.2012, p. 1812-1815.

Research output: Contribution to journalArticle

Origlieri, Marcus J. ; Yang, Hexiong ; Downs, Robert T ; Posner, Esther S. ; Domanik, Kenneth J. ; Pinch, William W. / Letter : The crystal structure of bartelkeite, with a revised chemical formula, PbFeGe VI(Ge 2 IVO 7) (OH) 2·H 2O, isotypic with high-pressure P2 1/m lawsonite. In: American Mineralogist. 2012 ; Vol. 97, No. 10. pp. 1812-1815.
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abstract = "Bartelkeite from Tsumeb, Namibia, was originally described by Keller et al. (1981) with the chemical formula PbFeGe 3O 8. By means of electron microprobe analysis, single-crystal X-ray diffraction, and Raman spectroscopy, we examined this mineral from the type locality. Our results show that bartelkeite is monoclinic with space group P2 1/m, unit-cell parameters a = 5.8279(2), b = 13.6150(4), c = 6.3097 (2) {\AA}, β = 127.314(2)°, and a revised ideal chemical formula PbFeGe VIGe 2 IVO 7(OH) 2·H 2O (Z = 2). Most remarkably, bartelkeite is isostructural with the high-pressure P2 1/m phase of lawsonite, CaAl 2Si 2O 7(OH)·H 2O, which is only stable above 8.6 GPa and a potential host for H 2O in subducting slabs. Its structure consists of single chains of edge-sharing FeO 6 and Ge1O 6 octahedra parallel to the c-axis, cross-linked by Ge2 2O 7 tetrahedral dimers. The average <Ge-O> bond lengths for the GeO 6 and GeO 4 polyhedra are 1.889 and 1.744 {\AA}, respectively. The Pb atoms and H 2O groups occupy large cavities within the framework. The hydrogen bonding scheme in bartelkeite is similar to that in lawsonite. Bartelkeite represents the first known mineral containing both 4- and 6-coordinated Ge atoms and may serve as an excellent analog for further exploration of the temperature-pressure-composition space of lawsonite.",
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T2 - The crystal structure of bartelkeite, with a revised chemical formula, PbFeGe VI(Ge 2 IVO 7) (OH) 2·H 2O, isotypic with high-pressure P2 1/m lawsonite

AU - Origlieri, Marcus J.

AU - Yang, Hexiong

AU - Downs, Robert T

AU - Posner, Esther S.

AU - Domanik, Kenneth J.

AU - Pinch, William W.

PY - 2012/10

Y1 - 2012/10

N2 - Bartelkeite from Tsumeb, Namibia, was originally described by Keller et al. (1981) with the chemical formula PbFeGe 3O 8. By means of electron microprobe analysis, single-crystal X-ray diffraction, and Raman spectroscopy, we examined this mineral from the type locality. Our results show that bartelkeite is monoclinic with space group P2 1/m, unit-cell parameters a = 5.8279(2), b = 13.6150(4), c = 6.3097 (2) Å, β = 127.314(2)°, and a revised ideal chemical formula PbFeGe VIGe 2 IVO 7(OH) 2·H 2O (Z = 2). Most remarkably, bartelkeite is isostructural with the high-pressure P2 1/m phase of lawsonite, CaAl 2Si 2O 7(OH)·H 2O, which is only stable above 8.6 GPa and a potential host for H 2O in subducting slabs. Its structure consists of single chains of edge-sharing FeO 6 and Ge1O 6 octahedra parallel to the c-axis, cross-linked by Ge2 2O 7 tetrahedral dimers. The average <Ge-O> bond lengths for the GeO 6 and GeO 4 polyhedra are 1.889 and 1.744 Å, respectively. The Pb atoms and H 2O groups occupy large cavities within the framework. The hydrogen bonding scheme in bartelkeite is similar to that in lawsonite. Bartelkeite represents the first known mineral containing both 4- and 6-coordinated Ge atoms and may serve as an excellent analog for further exploration of the temperature-pressure-composition space of lawsonite.

AB - Bartelkeite from Tsumeb, Namibia, was originally described by Keller et al. (1981) with the chemical formula PbFeGe 3O 8. By means of electron microprobe analysis, single-crystal X-ray diffraction, and Raman spectroscopy, we examined this mineral from the type locality. Our results show that bartelkeite is monoclinic with space group P2 1/m, unit-cell parameters a = 5.8279(2), b = 13.6150(4), c = 6.3097 (2) Å, β = 127.314(2)°, and a revised ideal chemical formula PbFeGe VIGe 2 IVO 7(OH) 2·H 2O (Z = 2). Most remarkably, bartelkeite is isostructural with the high-pressure P2 1/m phase of lawsonite, CaAl 2Si 2O 7(OH)·H 2O, which is only stable above 8.6 GPa and a potential host for H 2O in subducting slabs. Its structure consists of single chains of edge-sharing FeO 6 and Ge1O 6 octahedra parallel to the c-axis, cross-linked by Ge2 2O 7 tetrahedral dimers. The average <Ge-O> bond lengths for the GeO 6 and GeO 4 polyhedra are 1.889 and 1.744 Å, respectively. The Pb atoms and H 2O groups occupy large cavities within the framework. The hydrogen bonding scheme in bartelkeite is similar to that in lawsonite. Bartelkeite represents the first known mineral containing both 4- and 6-coordinated Ge atoms and may serve as an excellent analog for further exploration of the temperature-pressure-composition space of lawsonite.

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KW - Crystal structure

KW - Germanate

KW - Hydrous mineral

KW - Raman spectra

KW - X-ray diffraction

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