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Level 2

I: Formula


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Au
Ag
C
SiO2
SiO2:Fe
SiO2 (Microcrystalline)
Al2O3:Cr
Al2O3:Fe
MgAl2O4
NaAlSi2O6
Al2SiO4(F,OH)2
Be3Al2(SiO3)6:Cr
Be3Al2(SiO3)6:Fe
SiO2·nH2O (Amorphous)
CuAl6(PO4)4(OH)8·4H2O