The epidote group includes:
clinozoisite:
Ca2Al3[Si2O7][SiO4]O(OH)
epidote:
Ca2(Al2Fe3+)[Si2O7][SiO4]O(OH)
hancockite:
CaPb(Al2Fe3+)[Si2O7][SiO4]O(OH)
heflikite:
Ca2(Al2Sc)(Si2O7)(SiO4)O(OH)
mukhinite:
Ca2(Al2V3+)(Si2O7)(SiO4)O(OH)
piemontite:
Ca2(Al2Mn3+)[Si2O7]{SiO4]O(OH)
piemontite-(Pb):
CaPb(Al2Mn3+)[Si2O7]{SiO4]O(OH)
piemontite-(Sr):
CaSr(Al2Mn3+)[Si2O7]{SiO4]O(OH)
tweddillite:
CaSr(Mn3+2Al)[Si2O7][SiO4]O(OH)
The epidote group is a member of the epidote supergroup
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