'Pumpellyite Subgroup' (not an IMA approved species)
Formula:
Ca2XAl2[Si2O6(OH)][SiO4](OH)2A
Comments:
Reported in Ellingsen et al. (1995), but corrected in Ellingsen et al. (2000). The sample in question was showed to originate from another locality, and also showed to not be a pumpelliyte.