Synchysite

{{Infobox mineral

| name = Synchysite

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| image = Synchysite-107154.jpg

| imagesize = 260

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| caption = A synchysite with unknown end-member composition

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| formula = Ca(REE)(CO₃)₂F

| strunz = 5.BD.

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| system = Monoclinic and trigonal

| symmetry = C2/c (monoclinic)

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| mohs = 4.5

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| references = {{cite web|title=Synchysite-(Ce)|url=http://www.handbookofmineralogy.org/pdfs/synchysite-(Ce).pdf|work=handbookofmineralogy|accessdate=24 February 2013}}{{cite journal |last1=Wang |first1=L. |last2=Ni |first2=Y. |last3=Hughes |first3=J.M. |last4=Bayliss |first4=P. |last5=Drexler |first5=J.W. |journal=The Canadian Mineralogist |volume=32 |year=1994 |pages=865–871 |title=The atomic arrangement of synchysite-(Ce), CeCaF(CO3)2 |url=https://pubs.geoscienceworld.org/canmin/article-abstract/32/4/865/12586 |access-date=30 December 2020}}

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Synchysite is a group of carbonate minerals.{{cite web|title=Synchysite Group|url=http://www.mindat.org/min-32183.html|accessdate=24 February 2013}} 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.{{cite web|title=Synchysite-(Ce)|url=http://www.mindat.org/min-3853.html|accessdate=24 February 2013}}{{cite web|title=Huanghoite-(Ce)|url=http://www.mindat.org/min-1938.html|accessdate=24 February 2013}}

class="wikitable" style="text-align:center;" |+ Synchesite group
scope=col | Mineral name ! scope=col | Chemical formula ! scope=col | Symmetry ! scope=col | Space group
Huanghoite-(Ce)	{{chem|BaCe(CO|3|)|2|F}}	$3\backslash ;2/m$	$R\backslash ;\backslash overline\{3\}\backslash ;m$
Synchysite-(Ce)	{{chem|Ca(Ce,La)(CO|3|)|2|F}}	$2/m$	$C\backslash ;2/c$
Synchysite-(Nd)	{{chem|CaNd(CO|3|)|2|F}}	$2/m$	$C\backslash ;2/c$
Synchysite-(Y)	{{chem|CaY(CO|3|)|2|F}}	$2/m$	$C\backslash ;2/c$