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Norrishite: K(Mn+++2Li)Si4O10(O)2
Comments: Thin section photomicrograph showing norrishite (Nrs) associated with kornite (Krn), sugilite (Sgl), and Mn-rich pectolite (Pct) (AmMin 88:190). Location: Silicate-rich sample from the Wessels mine, Kalahari manganese field, South Africa. Scale: Picture Size 2.4 mm. © American Mineralogist