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Kornerupine group
[Mg
3
][Al
4
A
2
][OH|O
4
|Si
2
O
7
| X Si
2
O
10
]
[ Al
3+
][ Si
4+
]:
Kornerupine
[ Mg
2+
][ B
3+
]:
Prismatine
Class:
Sorosilicate
System: Orthorhombic