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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
Die Kristallstruktur von Langbeinit, K2 Mg2 (S O4)3.
Authors
Zemann, A.; Zemann, J.
Reference
IC&volume=10&fpage=409&details=yes target=icsd_help>Acta Crystallographica (1957)
10
, 409-413
Link
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Compound
K2 Mg2 O12 S3
- Dipotassium dimagnesium tris(sulfate(VI))
[
A2B2C3X12
] [
cP76
] [
b5 a4
] [
K2Mg2(SO4)3
]
Cell
9.920(4), 9.920(4), 9.920(4), 90., 90., 90.
P213 (198)
V=976.19
Remarks
R=0.148000 : P =19-974 : S =K2Mg2(SO4)3 : T X
Calculated density unusual but tolerable.
At least one temperature factor missing in the paper.
Structure type: K2 Mg2 (S O4)3
Prototype: K2 Mg2 (S O4)3
Atomic environment types: 4-a, 6-a, 9-a; 3#a, 4-a
Also langbeinite-type
Standardized with Structure Tidy
PDF 19-974, hk0 data only, isotypic to Tl2 Mn2 (S O4)3
Atom (site) Oxid.
x, y, z, B, Occupancy
K1
(4a)
1
K2
(4a)
1
Mg1
(4a)
2
Mg2
(4a)
2
S1
(12b)
6
O1
(12b)
-2
O2
(12b)
-2
O3
(12b)
-2
O4
(12b)
-2
0.56
0.56
0.56
0
1
0.79
0.79
0.79
0
1
0.08
0.08
0.08
0
1
0.35
0.35
0.35
0
1
0.03
0.26
0.37
0
1
0.01
0.19
0.24
0
1
0.17
0.25
0.42
0
1
0.02
0.05
0.71
0
1
0.00
0.41
0.34
0
1
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