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Scapolite group
[ A
4
][ X |(Al Y Si
2
O
8
)
3
]
Class:
Tecto-Aluminosilicate
Scapolite series
[ Na
+
][ Cl ][ Si ]:
Marialite
[ Ca
2+
][ CO
3
][ Al ]:
Meionite
Others
[ Ca
2+
][ SO
4
][ Al ]: Silvialite