AM_Ardealite
Formula: Ca (S.5 P.5) O6 H4
Name: Ardealite
Unit cell: 5.721 30.992 6.25 90.0 117.26 90.0 , V=985.08
Space group: C1C1 (9)

Sakae T , Nagata H , Sudo T , American Mineralogist , 63 (1978) p.520-527, The crystal structure of synthetic calcium phosphate - sulfate hydrate,, Ca2HPO4SO4.4H2O, and its relation to brushite and gypsum