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,){{cite journal|last1=Comodi|first1=P.|last2=Nazzareni|first2=S.|last3=Balic-Zunic|first3=T.|last4=Zucchini|first4=A.|last5=Hanfland|first5=M.|title=The high-pressure behavior of bloedite: A synchrotron single-crystal X-ray diffraction study|journal=American Mineralogist|date=14 February 2014|volume=99|issue=2–3|pages=511–518|doi=10.2138/am.2014.4640|bibcode=2014AmMin..99..511C|s2cid=49575865}} manganoblödite Na2Mn(SO4)2•4(H2O), cobaltoblödite Na2Co(SO4) 2•4(H2O), changoiteNa2Zn(SO4)2•4(H2O)