Geoscience Reference
In-Depth Information
Compound
Representative
Cell Parameter (
˚
)
Rare Earth, Co.
No., Average Bond
Distance (
˚
)
Tetrahedral
Radical Form
Rare Earth Polyhedra
c
5
6.81
I
4{NaYSiO
4
}NaF
l
4
z
5
8
Orthotetrahedra
Framework
a
5
11.579
c
5
5.396
Na
3
R[Si
2
O
7
]
Na
3
Sc[Si
2
O
7
]
Pbnm z
5
4
Sc
6
2.10
Diorthohedra
discrete poly
R
5
Er
Lu, Y, Sc
a
5
5.354
b
5
9.347
c
5
13.089
Na
6
YSc[Si
2
O
7
]
2
P6
3
z
5
4
Y
6
2.62
Diorthohedra
Discrete poly
a
5
10.726
6
2.71
b
5
13.491
K
3
Eu[Si
2
O
7
]
P6c2 z
5
6
Eu
6
2.31
Diortho-
Discrete polyhedra
a
5
9.956
c
5
14.455
K
3
Y[Si
3
O
8
(OH)
2
]
Pmnb z
5
4
Y
6
2.23
Triortho-
Discrete polyhedra
a
5
13.536
b
5
13.17
c
5
5.867
Na
4
Sc
2
[Si
4
O
13
]
Pna2
1
z
5
4
Sc
6
2.11
Tetra-
Polyhedra
a
5
14.442
b
5
5.288
c
14.219
5
K
4
Sc
2
[Si
4
O
12
]
Pbam z
5
8
Sc
6
2.09
4-Membered
Chain
(OH)
2
a
5
12.725
2
2.16
ring
(Continued)