Geoscience Reference
In-Depth Information
Compound
Representative
Cell Parameter (
˚
)
Rare Earth, Co.
No., Average
Bond Distance (
˚
)
Tetrahedral Radical Form
Rare Earth Polyhedra
b
5
12.95
c
5
8.72
R
2
[Si
2
O
7
]
Yb
2
[Si
2
O
7
]
P4
I
2
I
2 z
5
4
Diortho-
Framework
R
5
Tm
Lu
a
5
6.574
c
5
11.98
(Y,Th)
2
[Si
2
O
7
]
P2
1
/mz
5
2
Y
6
2.36
Diortho-
Layer
a
5
7.50
b
5
8.06
c
5
5.02
β
5
112
Y
3
[Si
3
O
10
](OH)
P2
1
/nz
5
6
Y
1.2
7
2.32
Triortho-
Layer
a
5
10.343
Y
3
8
2.43
b
5
7.284
c
5
11.093
γ
5
96.92
R
4
[Si
3
O
10
]
Ho
4
[Si
3
O
10
]
P
1
z
5
4
Ho
8
2.44
Triortho-
1
Ribbon
[SiO
4
] [SiO
4
]
a
5
6.664
Orthotetrahedra
R
5
Eu
Er
b
5
6.674
c
5
12.110
α
5
94.07
β
5
89.97
γ
5
91.66
