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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 crystallography of bastnaesite, parisite, roentgenite, and synchisite.
Authors
Donnay, G.;Donnay, J.D.H.
Reference
IC&volume=38&fpage=932&details=yes target=icsd_help>American Mineralogist (1953)
38
, 932-963
Link
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Compound
C3 Ca1 Ce2 F2 O9
-
[Parisite (Ce)]
Dicerium calcium difluoride tricarbonate
[
] [
hR102
] [
b14 a12
] [
]
Cell
7.124, 7.124, 84.1, 90., 90., 120.
R3H (146)
V=3696.37
Remarks
M =Parisite (Ce) : =33-269 :
Calculated density unusual but tolerable.
No R value given in the paper.
At least one temperature factor missing in the paper.
The lattice Parameters are unusual but agree with the paper.
Disordered crystal, for ordered one: a=7.176
For monoclinic form cp. 89803
PDF 33-269, subcell has a/SQRT(3), c/18
Atom (site) Oxid.
x, y, z, B, Occupancy
F1
(3a)
-1
F2
(3a)
-1
F3
(3a)
-1
F4
(3a)
-1
F5
(3a)
-1
F6
(3a)
-1
F7
(3a)
-1
F8
(3a)
-1
F9
(3a)
-1
F10
(3a)
-1
F11
(3a)
-1
F12
(3a)
-1
Ce1
(9b)
3
Ce2
(9b)
3
Ce3
(9b)
3
Ce4
(9b)
3
Ca1
(9b)
2
Ca2
(9b)
2
C1
(9b)
4
C2
(9b)
4
C3
(9*)
4
O1
(9b)
-2
O2
(9b)
-2
O3
(9b)
-2
O4
(9b)
-2
O5
(9b)
-2
O6
(9b)
-2
O7
(9*)
-2
0
0
0
0
1
0
0
0.33
0
1
0
0
0.66
0
1
0
0
0.10
0
1
0
0
0.44
0
1
0
0
0.77
0
1
0
0
0.16
0
1
0
0
0.5
0
1
0
0
0.83
0
1
0
0
0.27
0
1
0
0
0.60
0
1
0
0
0.94
0
1
0.33
0
0
0
1
0.33
0
0.10
0
1
0.33
0
0.16
0
1
0.33
0
0.27
0
1
0.33
0
0.05
0
1
0.33
0
0.22
0
1
0.24
0.33
0.13
0
1
0.24
0.33
0.30
0
1
0
4.
0.06
0.33
0.13
0
1
0.06
0.33
0.30
0
1
0.33
0.33
0.12
0
1
0.33
0.33
0.15
0
1
0.33
0.33
0.29
0
1
0.33
0.33
0.31
0
1
0
12.
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