Geoscience Reference
In-Depth Information
Compound
Representative
Cell Parameter (
˚
)
Rare Earth, Co.
No., Average Bond
Distance (
˚
)
Tetrahedral
Radical Form
Rare Earth Polyhedra
b
5
7.387
c
5
7.120
K
3
RSi
6
O
15
K
3
NdSi
6
O
15
Pbam z
5
4
Nd
6
2.38
Layers with 8-, 6-, 5-,
and 4-membered
rings
Discrete polyhedra
R
5
La
Lu
a
5
16.011
b
5
14.984
c
5
7.276
K
8
R
3
[Si
6
O
16
]
2
P1 z
5
l
Yb
6
2.26
Layers with 12-, 8-,
and 6-membered
rings
Discrete and bicapped
polyhedra
(OH)
K
8
Yb
3
[Si
6
O
16
]
2
a
5
6.808
R
5
La
Lu
(OH)
b
5
11.434
c
5
11.449
α
5
88.52
β
5
90.91
γ
5
100.10
K
2
Ce[Si
6
O
15
]
12/b z
5
4
Ce
8
2.23
Framework
Discrete
a
5
13.058
b
5
11.854
c
5
8.698
γ
5
90.15
Co. No.
5
coordination number
