General Information:
Chemical Formula:
(Y,Yb,Er)4Al2AlSi5O18(OH)5
Composition:
(Molecular Weight = 1,082.32 gm)
Yttrium 19.71 % Y
Erbium 6.18 % Er
Ytterbium 19.19 % Yb
Aluminum 7.48 % Al
Silicon 12.97 % Si
Hydrogen 0.47 % H
Oxygen 34.00 % O
Empirical Formula:
Y2.4Yb1.2Er0.4Al3Si5O18(OH)5
IMA Status:
Approved IMA 1987
Physical Properties:
Cleavage:
None
Color:
colorless or orange.
Density:
4.02
Diaphaniety:
Transparent
Hardness:
6-7 - Orthoclase-Quartz
Luster:
Adamantine
Streak:
white
More details...