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Monteregianite-(Y): (Na,K)6(Y,Ca)2Si16O38·10(H2O)
Comments: Feathery, radiating pinkish-white acicular monteregianite crystals on one end of greenish matrix. Location: Desourdy Quarry, Mont Saint-Hilaire, Quebec, Canada. Scale: Specimen Size 5x2.5x2.5 cm.. © John Betts - Fine Minerals