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Pt
HgS
(Zn,Fe)S
SnO2
Sb2S3
Cu2O
MnO2
Fe(1-x)S (x = 0 to 0.2)
FeO(OH)
FeTiO3
ZrSiO4
Cu5FeS4
KAlSi3O8
KFe3(OH)6(SO4)2
Ca5(PO4)3(F,Cl,OH)
