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Delhayelite: (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3·18(H2O)
Comments: Gray to creamy delhayelite crystal in matrix. Location: Mt. Rasvumchorr, Chibiny, Kola, Russia. Scale: Specimen Size 2.5x5 cm. © Diederik Visser