Pumpellyite is a group of closely related sorosilicate minerals:
* pumpellyite-(Mg): Ca2MgAl2[(OH)2|SiO4|Si2O7]·(H2O)
* pumpellyite-(Fe2+): Ca2Fe2+Al2[(OH)2|SiO4|Si2O7]·(H2O)
* pumpellyite-(Fe3+): Ca2(Fe3+,Mg,Fe2+)(Al,Fe3+)2[(OH,O)2|SiO4|Si2O7]·H2O
* pumpellyite-(Mn2+): Ca2(Mn2+,Mg)(Al,Mn3+,Fe3+)2[(OH)2|SiO4|Si2O7]·(H2O)
* pumpellyite-(Al): Ca2(Al,Fe2+,Mg)Al2[(OH,O)2|SiO4|Si2O7]·H2O