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Hellandite group

[X4][Y2][Z][T2][ W2 |Si4B4O22]
X: [ 3+: REE ][ 2+: Ca ][ 1+: Na ]
Y: [ 4+: Th, U ][ 3+: REE ][ 2+: Ca ]
Z: [ 4+: Ti ][ 3+: Al, Fe, Mn ]
T: [ 2+: Be ][ 1+: Li ]
W: [ 2-: O ][ 1-: OH, F ]