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Alum group
[ A
+
][ B
3+
][(SO
4
)
2
],12H
2
O
[ K ][ Al ]:
Alum-(K)
[ Na ][ Al ]:
Alum-(Na)
[ NH
4
][ Al ]:
Tschermigite
[ Tl ][ Al ]: Lanmuchangite
Class:
Sulfate
System: Cubic