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Kyanoxalite: Na7(Al5-6Si6-7O24)(C2O4)0.5-1.0·5H2O
Comments: Small aggregate of white kyanoxalite crystals in matrix. Location: Karnasurt Mt. Lovozero Massif, Kola Peninsula, Russia. Scale: Sample Size 15x8x6 mm. © Sergey Vasiliev / Systematic Mineralogy