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Gatelite-(Ce): (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3
Comments: B&W image of crystals of gatelite-(Ce). (AmMin, v88:223). Location: Trimouns talc deposit, Luzenac, Ariege, French Pyrenees. Scale: Crystal Length 700 µm. © R. Vernet / American Mineralogist