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Dellaite: Ca6Si3O11(OH)2 Rustumite: Ca10(Si2O7)2(SiO4)Cl2(OH)2
Comments: White grains of dellaite, intermixed with rustumite.
Location: Queretaro, Zacatecas, Mexico.
Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species