View source for Fluoro-richterite

{{infobox mineral
| name        = Fluororichterite
| image       = Fluororichterite-Calcite-280570.jpg
| imagesize   = 260px
| alt         = 
| caption     = Fluororichterite with calcite from Wilberforce, Monmouth Township, Haliburton County, Ontario, Canada (size: 6.6 x 4.4 x 3.8 cm)
| category    = [[Silicate mineral]]
| formula     = Na(NaCa)Mg<sub>5</sub>Si<sub>8</sub>O<sub>22</sub>F<sub>2</sub>
| IMAsymbol   = Flrct<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref>
| molweight   = 
| strunz      = 9.DE.20
| dana        = 
| system      = [[Monoclinic]]
| class       = Prismatic (2/m) <br/><small>(same [[H-M symbol]])</small>
| symmetry    = ''C2/m''
| unit cell   = a = 9.763, b = 17.89 <br/>c = 5.122&nbsp;[Å]; β = 102.25°; Z&nbsp;=&nbsp;2
| color       = Brown to brownish-red, rose-red, yellow, grey-brown, also pale to dark green
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| mohs        = 5–6
| luster      = Vitreous
| streak      = White
| diaphaneity = 
| gravity     = 3.17
| density     = 
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| 2V          = 
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| melt        = 
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| references  = <ref name=Mindat/><ref name=Webmin>[http://www.webmineral.com/data/Fluororichterite.shtml Fluororichterite: Webmineral.com]</ref><ref>{{Cite web |url=http://pubsites.uws.edu.au/ima-cnmnc/ |title=IMA Master List |access-date=2014-05-12 |archive-date=2015-01-05 |archive-url=https://web.archive.org/web/20150105154315/http://pubsites.uws.edu.au/ima-cnmnc/ |url-status=dead }}</ref>
}}
'''Fluororichterite''' is a rare [[amphibole]] with formula Na(NaCa)Mg<sub>5</sub>Si<sub>8</sub>O<sub>22</sub>F<sub>2</sub>.

==Occurrence==
Fluororichterite was first reported from the [[Ilmen Nature Reserve]], [[Ilmen Mountains]], [[Chelyabinsk Oblast]]', Southern [[Urals]], [[Russia]]. It was recognized by the [[International Mineralogical Association]] in 1994. Its name is derived from its [[fluorine]] content and relation to [[richterite]].<ref name=Mindat>[http://www.mindat.org/min-6952.html Fluororichterite: Mindat.org]</ref>

At the [[Type locality (geology)|type locality]] in the Ilmen Mountains fluororichterite occurs in [[Carbonate mineral|carbonate]] [[Vein (geology)|veins]] in [[amphibolite]]s and [[ultramafic rocks]].<ref>[http://www.mindat.org/loc-8247.html Type locality, Ilmen Mtns]</ref> In the Essonville occurrence in [[Wilberforce, Ontario]] it occurs in a [[limestone]] lens within a [[gneiss]] and is associated with [[phlogopite]] and [[calcite]].<ref>[http://www.mindat.org/loc-73287.html Essonville location, Mindat]</ref> It has also been reported from [[Austria]], [[Germany]], [[Italy]], [[Spain]] and [[China]].<ref name=Mindat/> At Coyote Peak in the Coastal Range, [[Humboldt County, California]], it occurs with a variety of rare minerals in an alkaline mafic [[diatreme]].<ref>[http://www.mindat.org/loc-3460.html Coyote Peak, Mindat]</ref>

== References ==
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[[Category:Calcium minerals]]
[[Category:Magnesium minerals]]
[[Category:Sodium minerals]]
[[Category:Fluorine minerals]]
[[Category:Amphibole group]]
[[Category:Monoclinic minerals]]
[[Category:Minerals in space group 12]]