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Holtite 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 ]
[ (Ta
0.6
, []
0.4
) ]: Holtite
[ (Nb
0.6
, []
0.4
) ]: Nioboholtite
[ (Ti
0.75
, []
0.25
) ]: Titanoholtite