# Parisite-(Ce)

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{{Redirect-distinguish|Parisite|Parasite}}{{Infobox mineral
| name        = Parisite
| boxwidth    = 
| boxbgcolor  = 
| image       = Parisite-39471.jpg
| imagesize   = 
| alt         = 
| caption     = Parisite from Muzo, Vasquez-Yacopí Mining District, [Boyacá Department](/source/Boyac%C3%A1_Department), Colombia, size: 1.3 x 1 x .7 cm
| category    = [Carbonate](/source/Carbonate)
| formula     = {{chem2|[Ca](/source/calcium)([Ce](/source/cerium),[La](/source/lanthanum))2([C](/source/carbon)[O](/source/oxygen)3)3[F](/source/fluorine)2}}
| IMAsymbol   = Pst<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   = 537.24 g/mol
| strunz      = 5.BD.20b
| dana        = 16a.01.05.01
| system      = [Monoclinic](/source/Monoclinic)
| class       = Domatic (m) <br/><small>(same [H-M symbol](/source/H-M_symbol))</small>
| symmetry    = ''Cc''
| unit cell   = a = 12.305&nbsp;Å, <br/>b = 7.1056&nbsp;Å, <br/>c = 28.2478&nbsp;Å; <br/>β = 98.246°; Z&nbsp;=&nbsp;12
| color       = Brown, brownish yellow, gray-yellow, grayish yellow, yellow, waxy yellow, colourless to yellow in transmitted light
| colour      = 
| habit       = [Acicular](/source/Acicular_(crystal_habit))
| twinning    = 
| cleavage    = 
| fracture    = 
| tenacity    = 
| mohs        = {{frac|4|1|2}}
| luster      = [Vitreous](/source/Vitreous_lustre) - [greasy](/source/Greasy_(lubrication))
| streak      = White
| diaphaneity = Transparent to translucent 
| gravity     = 4.34
| density     = 4.38
| polish      = 
| opticalprop = 
| refractive  = 
| birefringence = 
| pleochroism = 
| 2V          = 
| dispersion  = 
| extinction  = 
| length fast/slow =
| fluorescence = 
| absorption  = 
| melt        = 
| fusibility  = 
| diagnostic  = 
| solubility  = 
| impurities  = 
| alteration  = 
| other       = 
| prop1       = 
| prop1text   = 
| references  = <ref>[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Parisite-%28Ce%29 Mineralienatlas]</ref><ref>{{Cite web|url=http://www.mindat.org/min-3120.html|title = Parisite-(Ce)}}</ref><ref>{{Cite web|url=http://webmineral.com/data/Parisite-(Ce).shtml|title = Parisite-(Ce) Mineral Data}}</ref>
}}

'''Parisite''' is a rare [mineral](/source/mineral) consisting of [cerium](/source/cerium), [lanthanum](/source/lanthanum) and [calcium](/source/calcium) [fluoro](/source/Fluorine)-[carbonate](/source/carbonate), {{chem2|[Ca](/source/calcium)([Ce](/source/cerium),[La](/source/lanthanum))2([C](/source/carbon)[O](/source/oxygen)3)3[F](/source/fluorine)2}}. Parisite is mostly parisite-(Ce), but when [neodymium](/source/neodymium) is present in the structure the mineral becomes parisite-(Nd).

It is found only as [crystal](/source/crystal)s, which belong to the [trigonal](/source/hexagonal_(crystal_system)) or [monoclinic](/source/monoclinic) pseudo-hexagonal system and usually have the form of acute double [pyramid](/source/pyramid)s terminated by the basal planes; the [face](/source/face)s of the hexagonal pyramids are [striated](/source/%3Awikt%3Astriated) horizontally, and parallel to the [basal plane](/source/basal_plane) there is a perfect [cleavage](/source/cleavage_(crystal)). The crystals are hair-brown in color and are [translucent](/source/translucent). The [hardness](/source/Mohs_scale_of_mineral_hardness) is 4.5 and the [specific gravity](/source/specific_gravity) is 4.36. Light which has traversed a crystal of parisite exhibits a characteristic [absorption spectrum](/source/absorption_spectrum). 

At first, the only known occurrence of this mineral was in the famous [emerald](/source/emerald) [mine](/source/mining) at Muzo in [Colombia](/source/Colombia), [South America](/source/South_America), where it was found by J.J. Paris, who rediscovered and worked the mine in the early part of the 19th century; here it is associated with emerald in a [bituminous limestone](/source/bituminous_limestone) of [Cretaceous](/source/Cretaceous) age. 

Closely allied to parisite, and indeed first described as such, is a mineral from the [nepheline](/source/nepheline)-[syenite](/source/syenite) district of [Julianehaab](/source/Julianehaab) in south [Greenland](/source/Greenland). To this the name [synchysite](/source/synchysite) has been given. The crystals are [rhombohedral](/source/rhombohedral) (as distinct from hexagonal; they have the composition {{chem2|CeFCa(CO3)2}}, and [specific gravity](/source/specific_gravity) of 2.90. At the same locality there is also found a [barium](/source/barium)-parisite, which differs from the Colombian parisite in containing barium in place of calcium, the formula being {{chem2|(CeF)2[Ba](/source/barium)(CO3)3}}: this is named cordylite on account of the club-shaped form of its hexagonal crystals. [Bastnasite](/source/Bastnasite) is a cerium lanthanum and neodymium fluoro-carbonate {{chem2|(CeF)CO3}}, from Bastnas, near Riddarhyttan, in Vestmanland, Sweden, and the [Pikes Peak](/source/Pikes_Peak) region in [Colorado](/source/Colorado), United States.

==References==
{{Reflist}}

==External links==
{{Commons category}}
*{{cite encyclopedia|url=http://www.handbookofmineralogy.org/pdfs/parisite-(Ce).pdf
 |title=Parisite-(Ce) |encyclopedia=Handbook of Mineralogy |editor1-first=John W. |editor1-last=Anthony|editor2-first=Richard A. |editor2-last=Bideaux|editor3-first=Kenneth W. |editor3-last=Bladh|editor4-first= Monte C. |editor4-last=Nichols |publisher=Mineralogical Society of America|location=Chantilly, VA |year=1990–2013}}

{{1911|wstitle=Parisite|volume=20|page=825}}

Category:Calcium minerals
Category:Lanthanide minerals
Category:Carbonate minerals
Category:Monoclinic minerals
Category:Minerals in space group 9

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Adapted from the Wikipedia article [Parisite-(Ce)](https://en.wikipedia.org/wiki/Parisite-(Ce)) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Parisite-(Ce)?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.