is a Calcium Cerium Lanthanum Neodymium Yttrium Carbonate Fluoride with Chemistry: Ca(Ce, La, Nd, Y)(CO3)2F formula and hardness of 4-4.5.Synchysite has cerium, neodymium, lanthanum and yttrium in its generalized formula but officially the mineral is divided into three minerals based on the respective predominant rare earth element. There is synchysite-(Ce) with a more accurate formula of Ca(Ce, La)(CO3)2F. There is also synchysite-(Nd) with a formula of Ca(Nd, La)(CO3)2F. And finally there is the very rare synchysite-(Y) with a formula of Ca(Y, Ce)(CO3)2F. There is little difference in the three in terms of physical properties and most synchysite is synchysite-(Ce). Minor mineral are present such Yttrofluorite and Albite
Is an opaque mineral that occur in a USA famous locality:White Cloud Pegmatite, South Platte district, Jefferson County, COLORADO.