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 Na<sub>2</sub>Mg(SO<sub>4</sub>)<sub>2</sub>â¢4H<sub>2</sub>O, leonite K<sub>2</sub>Mg(SO<sub>4</sub>)<sub>2</sub>â¢4(H<sub>2</sub>O), anapaite Ca<sub>2</sub>Fe(PO<sub>4</sub>)<sub>2</sub>â¢4(H<sub>2</sub>O), schertelite (NH<sub>4</sub>)<sub>2</sub>Mg(PO<sub>3</sub>OH)<sub>2</sub>â¢4(H<sub>2</sub>O,) manganoblödite Na<sub>2</sub>Mn(SO<sub>4</sub>)<sub>2</sub>â¢4(H<sub>2</sub>O), cobaltoblödite Na<sub>2</sub>Co(SO<sub>4</sub>) <sub>2</sub>â¢4(H<sub>2</sub>O), changoiteNa<sub>2</sub>Zn(SO<sub>4</sub>)<sub>2</sub>â¢4(H<sub>2</sub>O)