AM_Beta-roselite Formula: Ca2 (Co.532 Mg.468) As2 O10 H4 Name: Beta-roselite Unit cell: 5.884 6.981 5.564 97.33 108.93 108.18 , V=198.63 Space group: P-1 (2)

Joswig W , Paulus E F , Liebscher B , Zeitschrift fur Kristallographie , 219 (2004) p.341-342, Crystal structure of dicalcium (cobalt,magnesium) diarsenate dihydrate,, Ca2(Co0.532Mg0.468)[AsO4]2*2H2O, hydrogen bonding in talmessite, Locality: Bou-Azzer, Morocco