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Silvialite: (Ca,Na)4Al6Si6O24(SO4,CO3)
Comments: BSE image of silvialite (Sil), plagioclase (An70)-calcite symplectite (P-C) corona, and plagioclase (An45, P). MinMag, v63:321. Location: Upper-mantle garnet-granulite xenoliths hosted by olivine nephelinite, from McBride Province, North Queensland, Australia. Scale: Scale Bar 100 µm. © Mineralogical Magazine