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Perrierite comprises two minerals.
Formulae:
Perrierite-(Ce):
Ce4MgFe3+2Ti2O8(Si2O7)2
Perrierite-(La): (La,Ce,Ca)4(Fe2+,Mn)(Ti,Fe3+,Al)4[(Si2O7)O4]2
Both are monoclinic titanium-bearing sorosilicates
(Si2O7 groups)
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