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Dumortierite group
[ X ][Al
3+
6
][O
3
|BO
3
|(SiO
4
)
3
]
Class:
Dumortierite supergroup
Class:
Nesosilicate
-
Borate
-
Oxide
System: Orthorhombic
Group: mmm, Pnma
[ X ]
[ Al ][ O ]:
Dumortierite
[ Mg ][ OH ]: Magnesiodumortierite