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CC=Collection Code: [AB2X4]=ANX Form: [cF56]=Pearson: [e d a]=Wyckoff Symbol: [Al2MgO4]=Structure Type:
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CC=39449
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Title
Crystal structure of a new natural Na,K,Fe-silicate.
Authors
Rastsvetaeva, R.K.;Rekhlova, O.Yu.;Khomyakov, A.P.
Reference
Kristallografiya (1991)
36
, 892-897
Link
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Compound
H14 Fe0.9 K3 Mg0.1 Mn0.7 Na4 O29 Si8 Ti0.4
-
[Ershovite]
Sodium potassium iron manganese titanium magnesium silicate hydrate *
[
] [
aP60
] [
i23 h
] [
]
Cell
10.244(2), 11.924(3), 5.276(3), 103.491(2), 96.960(3), 91.945(3)
P1- (2)
V=620.77
Remarks
R=0.041000 : D M =Ershovite : P =46-1424 :
A site occupation is implausible or meaningless but agrees with the paper.
The coordinates are those given in the paper but the atomic distances do not agree with those calculated during testing.The coordinates are probably correct.
Calculated density unusual but tolerable.
Atom (site) Oxid.
x, y, z, B, Occupancy
Si1
(2i)
4
Si2
(2i)
4
Si3
(2i)
4
Si4
(2i)
4
Na1
(2i)
1
Na2
(2i)
1
K1
(2i)
1
K2
(1h)
1
Fe1
(2i)
2
Mn1
(2i)
2
Ti1
(2i)
4
Mg1
(2i)
2
O1
(2i)
-2
O2
(2i)
-2
O3
(2i)
-2
O4
(2i)
-2
O5
(2i)
-2
O6
(2i)
-2
O7
(2i)
-2
O8
(2i)
-2
O9
(2i)
-2
O10
(2i)
-2
O11
(2i)
-2
O12
(2i)
-2
O13
(2i)
-2
O14
(2i)
-2
H1
(2i)
1
H2
(2i)
1
H3
(2i)
1
H4
(2i)
1
H5
(2i)
1
H6
(2i)
1
H7
(2i)
1
O15
(2i)
-2
0.73
0.27
0.42
1.16
1
0.71
0.67
0.13
1.16
1
0.73
0.41
0.98
1.12
1
0.68
0.80
0.69
1.22
1
0.97
0.86
0.46
1.86
1
0.99
0.73
0.88
2.30
1
0.55
0.13
0.82
1.91
1
0.5
0.5
0.5
3.04
1
0.00
0.42
0.70
1.48
0.45
0.00
0.42
0.70
1.48
0.35
0.00
0.42
0.70
1.48
0.2
0.00
0.42
0.70
1.48
0.05
0.67
0.35
0.68
1.5(
1
0.89
0.28
0.47
1.5(
1
0.64
0.72
0.88
1.7(
1
0.87
0.68
0.17
1.6(
1
0.89
0.43
0.01
1.5(
1
0.82
0.86
0.77
1.8(
1
0.66
0.53
0.05
1.6(
1
0.64
0.73
0.39
1.6(
1
0.68
0.33
0.17
1.4(
1
0.67
0.14
0.35
1.7(
1
0.57
0.90
0.72
1.7(
1
0.89
0.54
0.57
2.1(
1
0.86
0.99
0.26
2.7(
1
0.85
0.11
0.81
2.8(
1
0.86
0.94
0.14
1.2(
1
0.50
0.87
0.68
2.9(
1
0.81
0.04
0.26
2.6(
1
0.85
0.03
0.80
3.4(
1
0.81
0.12
0.66
2.2(
1
0.83
0.55
0.52
4.3(
1
0
1.
0
0.5
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