General Information:
Chemical Formula:
(Y,Yb,Er,Dy,Lu,Gd,Tm,Ho)4Al(SiO4)2(OH)2F5
IMA Status:
Approved IMA
Physical Properties:
Cleavage:
[???] Good
Color:
colorless, white, or light pink.
Density:
4.3
Diaphaniety:
Transparent
Hardness:
4-5 - Fluorite-Apatite
Streak:
white
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