The lawsonite group includes:
amamoorite:
CaMn2+2Mn3+(Si2O7)O(OH)
hennomartinite:
SrMn3+2(Si2O7)(OH)2.H2O
ilvaite:
CaFe3+Fe2+2O(Si2O7)(OH)
lawsonite:
CaAl2(Si2O7)(OH)2.H2O
noelbensonite:
BaMn3+2Si2O7(OH)2.H2O
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