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Dumortierite supergroup

[X][Y₆][BZ₃W₁₈]

X: [ 5+: Ta, Nb ][ 4+: Ti ][ 3+: Al, Fe ][2+: Mg][ 0: [] ]

Y: [ 3+: Al ]

Z: [ 4+: Si ][ 3+: As, Sb ]

W: [ 2-: O ][ 1-: OH ][ 0: [] ]

• [ X ]
• [ X^{3+, 2+} ]: Dumortierite group
• [ (X^{5+, 4+}, []) ]: Holtite group
• [ X⁰ ]: Szklaryite

• Class: Nesosilicate - Borate - Oxide
• System: Orthorhombic
• Group: mmm, Pnma