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Tumchaite: Na2(Zr,Sn)Si4O11·2(H2O)
Comments: SEM photomicrograph of typical tumchaite crystals shaped by the prism {hkl}, and by two pinacoids {100} and {h0l}. Grains are tabular on (100), elongated along [001]. (AmMin 85:1517). Location: Vuoriyarvi alkali-ultrabasic massif, Murmansk Region, Russia. Scale: See Image. © American Mineralogist