Geoscience Reference
In-Depth Information
Cell Parameter (
˚
)
Compound
Representative
Rare Earth, Co.
No., Average Bond
Distance (
˚
)
Tetrahedral
Radical Form
Rare Earth Polyhedra
NaR[SiO
4
]
NaY[SiO
4
]
Pbn2
1
z
5
4
Y
6
2.26
Orthotetrahedra
Discrete
R
5
Er
Lu, Y
a
5
5.09
Polyhedra
b
5
10.96
c
5
6.35
NaR[SiO
4
]
NaSm[SiO
4
]
14/m z
5
8
Sm
8
2.51
Orthotetrahedra
Framework
R
Nd
Ho
a
5
11.89
5
c
5
5.45
NaR[SiO
4
]
NaNd[SiO
4
]
Pna2
1
z
5
12
Nd
8
2.45
Orthotetrahedra
Column
R
5
Ce
Nd
a
5
20.00
b
5
9.28
c
5
5.45
KNd
9
[SiO
4
]
6
O
2
P6
3
z
5
1
Nd
7
2.48
Orthotetrahedra
Framework
a
5
9.576
(K,Nd)
9
2.48
c
5
7.009
(K,Nd)
9
2.75
LiY[SiO
4
]
P2
I
/b z
5
4
Y
7
2.01
Orthotetrahedra
Layers from 6-membered
ring, seven-sided
framework
a
5
5.368
b
5
10.806
c
5
6.195
γ
5
113.40
Na
2
R[SiO
4
]OH
Pnma z
5
4
La
8
2.59
Orthotetrahedra
Na
2
La[SiO
4
]OH
a
5
9.72
R
5
La
Pr
b
5
7.57
(Continued)