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Synchysite

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.

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Synchysite
A synchysite with unknown end-member composition
General
CategoryMinerals
FormulaCa(REE)(CO3)2F
Strunz classification5.BD.
Crystal systemMonoclinic and trigonal
Space groupC2/c (monoclinic)
Identification
Mohs scale hardness4.5
References12

Synchysite is a group of carbonate minerals.3 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.45

Synchesite group
Mineral name Chemical formula Symmetry Space group
Huanghoite-(Ce) BaCe(CO
3)
2F		 3 2 / m {\displaystyle 3\;2/m} R 3 ¯ m {\displaystyle R\;{\overline {3}}\;m}
Synchysite-(Ce) Ca(Ce,La)(CO
3)
2F		 2 / m {\displaystyle 2/m} C 2 / c {\displaystyle C\;2/c}
Synchysite-(Nd) CaNd(CO
3)
2F		 2 / m {\displaystyle 2/m} C 2 / c {\displaystyle C\;2/c}
Synchysite-(Y) CaY(CO
3)
2F		 2 / m {\displaystyle 2/m} C 2 / c {\displaystyle C\;2/c}
References

References

  1. "Synchysite-(Ce)" (PDF). handbookofmineralogy. Retrieved 24 February 2013.
  2. Wang, L.; Ni, Y.; Hughes, J.M.; Bayliss, P.; Drexler, J.W. (1994). "The atomic arrangement of synchysite-(Ce), CeCaF(CO3)2". The Canadian Mineralogist. 32: 865–871. Retrieved 30 December 2020.
  3. "Synchysite Group". Retrieved 24 February 2013.
  4. "Synchysite-(Ce)". Retrieved 24 February 2013.
  5. "Huanghoite-(Ce)". Retrieved 24 February 2013.