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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=203054
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Title
Crystal-chemical study of cation disordering in Al-rich and Al-poor orthopyroxenes from spinel iherzolite xenoliths.
Authors
Molin, G.M.
Reference
IC&volume=74&fpage=593&details=yes target=icsd_help>American Mineralogist (1989)
74
, 593-598
Link
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Compound
Fe0.21 Mg1.79 O6 Si2
-
[Enstatite, ferroan]
Magnesium iron catena-disilicate (1.8/0.2/1)
[
ABX3
] [
oP80
] [
c10
] [
]
Cell
18.2440(10), 8.805(1), 5.196(1), 90., 90., 90.
PBCA (61)
V=834.68
Remarks
R=0.025000 : M =Enstatite, ferroan : P =19-768 :
PDF 19-768, mean T-O: 1.628, 1.647, M-O: 2.069, 2.161
Sample Le4A, heated to 1323 K for 90 min
Atom (site) Oxid.
x, y, z, B, Occupancy
Mg1
(8c)
2
Fe1
(8c)
2
Mg2
(8c)
2
Fe2
(8c)
2
Si1
(8c)
4
Si2
(8c)
4
O1
(8c)
-2
O2
(8c)
-2
O3
(8c)
-2
O4
(8c)
-2
O5
(8c)
-2
O6
(8c)
-2
0.37
0.65
0.86
0
0.94
0.37
0.65
0.86
0
0.05
0.37
0.48
0.35
0
0.84
0.37
0.48
0.35
0
0.15
0.27
0.34
0.04
0
1
0.47
0.33
0.80
0
1
0.18
0.33
0.03
0
1
0.31
0.50
0.04
0
1
0.30
0.22
0.82
0
1
0.56
0.33
0.80
0
1
0.43
0.48
0.69
0
1
0.44
0.19
0.60
0
1
Atom (site) Oxid.
U11, U22, U33, U12, U13, U23
Mg1
(8c)
2
Fe1
(8c)
2
Mg2
(8c)
2
Fe2
(8c)
2
Si1
(8c)
4
Si2
(8c)
4
O1
(8c)
-2
O2
(8c)
-2
O3
(8c)
-2
O4
(8c)
-2
O5
(8c)
-2
O6
(8c)
-2
0.00
0.00
0.00
0.00
-.00
0.00
0.00
0.00
0.00
0.00
-.00
0.00
0.01
0.01
0.01
-.00
-.00
-.00
0.01
0.01
0.01
-.00
-.00
-.00
0.00
0.00
0.00
-.00
0.00
-.00
0.00
0.00
0.00
0.00
-.00
0.00
0.00
0.00
0.01
-.00
-.00
-.00
0.01
0.00
0.01
-.00
-.00
-.00
0.01
0.01
0.01
0.00
0.00
-.00
0.00
0.01
0.01
-.00
0.00
0.00
0.01
0.01
0.01
0.00
0.00
0.00
0.00
0.01
0.01
0.00
-.00
-.00
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