Blodite group

The blodite group (or Blödite group) is a group of minerals with two (in most cases divalent) cations and two anions. The group includes blödite Na2Mg(SO4)2•4H2O, leonite K2Mg(SO4)2•4(H2O), anapaite Ca2Fe(PO4)2•4(H2O), schertelite (NH4)2Mg(PO3OH)2•4(H2O,) manganoblödite Na2Mn(SO4)2•4(H2O), cobaltoblödite Na2Co(SO4) 2•4(H2O), changoiteNa2Zn(SO4)2•4(H2O)