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Quintinite-3T: Mg4Al2(OH)12CO3·4(H2O) Quintinite-2H: Mg4Al2(OH)12CO3·4(H2O)
Comments: Pale brownish crystals of quintinite, 2H or 2T polytype unknown. Location: Jacupiranga Mine, São Paulo, Southeast Region, Brazil. Scale: Picture size 7 mm. © Thomas Witzke / Abraxas-Verlag