The ellestadite group includes:
chlorellestadite:
Ca5(SiO4)1.5(SO4)1.5Cl
fluorellestadite:
Ca5(SiO4)1.5(SO4)1.5F
hydroxylellestadite:
Ca5(SiO4)1.5(SO4)1.5OH
mattheddleite:
Pb5(SiO4)1.5(SO4)1.5Cl
The ellestadite group is a member of the apatite supergroup
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