Synchysite
![A synchysite with unknown end-member composition.](/Images/godic/202502/14/Synchysite-1071540401.jpg")
Synchysite is a group of carbonate minerals. The three isostructural chemical end members are Synchysite-(Ce), Synchysite-(Nd) and Synchysite-(Y). Huanghoite-(Ce) belongs to the group, but has a different symmetry and calcium is replaced by barium.