The chegemite subgroup includes:
chegemite:
Ca7(SiO4)3(OH)2
edgrewite:
Ca9(SiO4)4F2
fluorchegemite:
Ca7(SiO4)3F2
hydroxyledgrewite:
Ca9(SiO4)4(OH)2
reinhardbraunsite:
Ca5(SiO4)2(OH)2
The chegemite subgroup is a member of the humite group.
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