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Potassicrichterite: (K,Na)(CaNa)2Mg5[Si8O22](OH,F)2
Comments: Lapidary sample of 'Dianite' consisting of blue nepherite with fiberous strontian (~3.5 % SrO) potassicrichterite. White nodule is quartz-microcline surrounded by dark green potassic-magnesio-arfvedsonite. Location: Kedrovyi alkaline Massif, Murunskii Massif, Chara and Tokko Rivers Confluence, Aldan Shield, Saha Republic (Sakha Republic; Yakutia), Eastern-Siberian Region, Russia. Scale: Specimen Size 8.5x4x1 cm. © Pavel M. Kartashov