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Synchysite
A synchysite with unknown end-member composition
General
Category	Mineral
Formula (repeating unit)	Ca(REE)(CO3)2F
Strunz classification	5.BD.
Crystal system	Monoclinic and trigonal
Space group	C2/c (monoclinic)
Identification
Mohs scale hardness	4.5
References

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.

Synchesite group

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

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.

• Carbonate minerals
• Monoclinic minerals
• Minerals in space group 15