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CC=Collection Code: [AB2X4]=ANX Form: [cF56]=Pearson: [e d a]=Wyckoff Symbol: [Al2MgO4]=Structure Type:
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Title
The crystal structure of preiswerkite.
Authors
Oberti, R.;Ungaretti, L.;Tlili, A.;Smith, D.C.;Robert, J.-L.
Reference
IC&volume=78&fpage=129&details=yes target=icsd_help>American Mineralogist (1993)
78
, 129-129
Link
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Compound
H2 Al3.15 Mg1.85 Na0.85 O12 Si2
-
[Preiswerkite 1M]
Sodium magnesium aluminium phyllo-dialumodisilicate hydroxide (0.9/1.9/1.2/1/2)
[
ABC6X12
] [
mS44
] [
j3 i2 h d a
] [
]
Cell
5.228(7), 9.049(10), 9.819(12), 90., 100.41(13), 90.
C12/M1 (12)
V=456.87
Remarks
R=0.046000 : M =Preiswerkite 1M : =42-605 : D
Calculated density unusual but tolerable.
PDF 42-605, sample KP17, mean M-O: 2.060, 2.007
Atom (site) Oxid.
x, y, z, B, Occupancy
O1
(8j)
-2
O2
(4i)
-2
O3
(8j)
-2
O4
(4i)
-2
Si1
(8j)
4
Al1
(8j)
3
Mg1
(2d)
2
Al2
(2d)
3
Mg2
(4h)
2
Al3
(4h)
3
Na1
(2a)
1
H1
(4i)
1
0.85
0.19
0.15
0
1
0.45
0
0.16
0
1
0.63
0.17
0.39
0
1
0.12
0
0.39
0
1.
0.57
0.16
0.21
0
0.5
0.57
0.16
0.21
0
0.5
0
0.5
0.5
0
0.85
0
0.5
0.5
0
0.15
0
0.83
0.5
0
0.5
0
0.83
0.5
0
0.5
0
0
0
0
0.85
0.08
0
0.29
1.
1
Atom (site) Oxid.
Beta11, Beta22, Beta33, Beta12, Beta13, Beta23
O1
(8j)
-2
O2
(4i)
-2
O3
(8j)
-2
O4
(4i)
-2
Si1
(8j)
4
Al1
(8j)
3
Mg1
(2d)
2
Al2
(2d)
3
Mg2
(4h)
2
Al3
(4h)
3
Na1
(2a)
1
H1
(4i)
1
0.00
0.00
0.00
0.00
0.00
-.00
0.01
0.00
0.00
0
0.00
0
0.00
0.00
0.00
-.00
-.00
0.00
0.00
0.00
0.00
0
-.00
0
0.00
0.00
0.00
-.00
0.00
-.00
0.00
0.00
0.00
-.00
0.00
-.00
0.00
0.00
0.00
0
0.00
0
0.00
0.00
0.00
0
0.00
0
0.00
0.00
0.00
0
0.00
0
0.00
0.00
0.00
0
0.00
0
0.01
0.00
0.00
0
0.00
0
0
0
0
0
0
0
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