The crystal structure of preiswerkite

R. Oberti; L. Ungaretti; A. Tlili; D. C. Smith; J. L. Robert

The crystal structure of preiswerkite

R. Oberti, L. Ungaretti, A. Tlili, D. C. Smith, J. L. Robert

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

32 Scopus citations

Abstract

The structure of preiswerkite, ideally Na(Mg₂Al)(Si₂Al₂)O₁₀(OH)₂, from the type locality at Geisspfad in Switzerland, has been determined by single-crystal X-ray diffraction and refinement. The polytype is 1M with space group C2/m. The unit-cell parameters are a = 5.228(7), b = 9.049(10), c = 9.819(12) Å, β = 100.42(13)°. Preiswerkite shares specific structures properties with a number of micas with very different compositions; apart from tetrahedral ordering, the closest structural analogue seems to be ephesite, ideally Na(LiAl₂)(Si₂Al₂)O₁₀(OH)₂, which differs chemically only by the octahedral substitution Mg + Mg ⇌ Li + Al. -from Authors

Original language	English
Pages (from-to)	1290-1298
Number of pages	9
Journal	American Mineralogist
Volume	78
Issue number	11-12
State	Published - 1993
Externally published	Yes

Cite this

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title = "The crystal structure of preiswerkite",

abstract = "The structure of preiswerkite, ideally Na(Mg2Al)(Si2Al2)O10(OH)2, from the type locality at Geisspfad in Switzerland, has been determined by single-crystal X-ray diffraction and refinement. The polytype is 1M with space group C2/m. The unit-cell parameters are a = 5.228(7), b = 9.049(10), c = 9.819(12) {\AA}, β = 100.42(13)°. Preiswerkite shares specific structures properties with a number of micas with very different compositions; apart from tetrahedral ordering, the closest structural analogue seems to be ephesite, ideally Na(LiAl2)(Si2Al2)O10(OH)2, which differs chemically only by the octahedral substitution Mg + Mg ⇌ Li + Al. -from Authors",

author = "R. Oberti and L. Ungaretti and A. Tlili and Smith, {D. C.} and Robert, {J. L.}",

year = "1993",

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T1 - The crystal structure of preiswerkite

AU - Oberti, R.

AU - Ungaretti, L.

AU - Tlili, A.

AU - Smith, D. C.

AU - Robert, J. L.

PY - 1993

Y1 - 1993

N2 - The structure of preiswerkite, ideally Na(Mg2Al)(Si2Al2)O10(OH)2, from the type locality at Geisspfad in Switzerland, has been determined by single-crystal X-ray diffraction and refinement. The polytype is 1M with space group C2/m. The unit-cell parameters are a = 5.228(7), b = 9.049(10), c = 9.819(12) Å, β = 100.42(13)°. Preiswerkite shares specific structures properties with a number of micas with very different compositions; apart from tetrahedral ordering, the closest structural analogue seems to be ephesite, ideally Na(LiAl2)(Si2Al2)O10(OH)2, which differs chemically only by the octahedral substitution Mg + Mg ⇌ Li + Al. -from Authors

AB - The structure of preiswerkite, ideally Na(Mg2Al)(Si2Al2)O10(OH)2, from the type locality at Geisspfad in Switzerland, has been determined by single-crystal X-ray diffraction and refinement. The polytype is 1M with space group C2/m. The unit-cell parameters are a = 5.228(7), b = 9.049(10), c = 9.819(12) Å, β = 100.42(13)°. Preiswerkite shares specific structures properties with a number of micas with very different compositions; apart from tetrahedral ordering, the closest structural analogue seems to be ephesite, ideally Na(LiAl2)(Si2Al2)O10(OH)2, which differs chemically only by the octahedral substitution Mg + Mg ⇌ Li + Al. -from Authors

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M3 - Article

AN - SCOPUS:0027801155

SN - 0003-004X

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JO - American Mineralogist

JF - American Mineralogist

IS - 11-12

ER -

The crystal structure of preiswerkite

Abstract

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