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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 high-pressure crystal chemistry of low albite and the origin of the pressure dependency of Al-Si ordering.
Authors
Downs, R.T.;Hazen, R.M.;Finger, L.W.
Reference
IC&volume=79&fpage=104&details=yes target=icsd_help>American Mineralogist (1994)
79
, 104-105
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Compound
Al1 Na1 O8 Si3
-
[Albite low]
Sodium tecto-alumotrisilicate
[
ABC3X8
] [
aP26
] [
i13
] [
]
Cell
7.9567(21), 12.6784(10), 7.0897(37), 94.217(21), 116.992(24), 88.025(15)
C1- (2)
V=635.56
Remarks
R=0.065000 : P =2680 : M =Albite low :
Mean T-O: 1.730, 1.589, 1.622, 1.613
Atom (site) Oxid.
x, y, z, B, Occupancy
Al1
(4i)
3
Si2
(4i)
4
Si3
(4i)
4
Si4
(4i)
4
Na1
(4i)
1
O1
(4i)
-2
O2
(4i)
-2
O3
(4i)
-2
O4
(4i)
-2
O5
(4i)
-2
O6
(4i)
-2
O7
(4i)
-2
O8
(4i)
-2
0.00
0.16
0.20
0.60
1
-.00
0.82
0.23
0.54
1
0.68
0.10
0.31
0.49
1
0.67
0.88
0.35
0.48
1
0.25
0.99
0.13
3.8(
1
0.00
0.12
0.96
0.90
1
0.58
0.99
0.28
0.68
1
0.80
0.10
0.18
0.99
1
0.81
0.84
0.25
1.27
1
-.00
0.30
0.27
0.88
1
0.01
0.69
0.22
0.78
1
0.21
0.11
0.38
1.32
1
0.17
0.86
0.42
1.59
1
Atom (site) Oxid.
Beta11, Beta22, Beta33, Beta12, Beta13, Beta23
Al1
(4i)
3
Si2
(4i)
4
Si3
(4i)
4
Si4
(4i)
4
Na1
(4i)
1
O1
(4i)
-2
O2
(4i)
-2
O3
(4i)
-2
O4
(4i)
-2
O5
(4i)
-2
O6
(4i)
-2
O7
(4i)
-2
O8
(4i)
-2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0.01
0.00
0.04
-.00
0.01
-.00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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