AM_Attakolite
Formula: Ca Mn Al4 Si P3 O20 H5
Name: Attakolite
Unit cell: 17.188 11.477 7.322 90.0 113.83 90.0 , V=1321.25
Space group: C12/M1 (12)

Grice J D , Dunn P J , American Mineralogist , 77 (1992) p.1285-1291, Attakolite: New data and crystal-structure determination