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Ellestadite group
[A
2+
10
][X
2
|(SiO
4
)
3
|(SO
4
)
3
]
Class:
Apatite supergroup
Class:
Phosphate
System: Hexagonal, Pseudohexagonal
Fluorellestadite
Hydroxylellestadite
Hydroxylmattheddleite
Mattheddleite