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Ellestadite originally was an approved mineral species, but then it was divided into two species,
fluorellestadite:
Ca5(SiO4)1.5(SO4)1.5F
and
hydroxyellestadite:
Ca5(SiO4)1.5(SO4)1.5OH.
Chlorellestadite:
Ca5(SiO4)1.5(SO4)1.5Cl
was added later.
All are nesosilicates (insular SiO4 groups) and members of the
ellestadite group,
apatite supergroup.
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