# Tongbaite

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> Markdown URL: https://mediated.wiki/source/Tongbaite.md
> Source: https://en.wikipedia.org/wiki/Tongbaite
> Source revision: 1333918321
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{{short description|Type of rare mineral}}
{{Infobox mineral
| name        = Tongbaite
| category    = Carbide mineral
| boxwidth    =
| boxbgcolor  =
| image       =Tongbaite.jpg
| imagesize   =
| caption     =
| formula     = Cr<sub>3</sub>C<sub>2</sub>
| IMAsymbol   = Tgb<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      = 1.BA.15
| dana        =
| system      = [Orthorhombic](/source/Orthorhombic)
| class       = Dipyramidal (mmm) <br/>[H-M symbol](/source/H-M_symbol): (2/m 2/m 2/m)
| symmetry    = ''Pnma''
| unit cell   = a = 5.52&nbsp;[Å](/source/%C3%85ngstr%C3%B6m), b = 11.48&nbsp;Å <br/>c = 2.82&nbsp;Å; Z&nbsp;=&nbsp;4
| color       = Pale brownish yellow; pale violet in reflected light
| habit       = Prismatic crystals, pseudohexagonal
| twinning    =
| cleavage    = 
| fracture    =
| tenacity    = Brittle
| mohs        = 8.5
| luster      = Metallic
| refractive  =
| opticalprop =
| birefringence =
| pleochroism =
| streak      =
| gravity     = 6.64 calculated
| density     =
| melt        =
| fusibility  =
| diagnostic  =
| solubility  =
| diaphaneity = Opaque
| other       =
| references  = <ref name=HBM>[http://www.handbookofmineralogy.org/pdfs/tongbaite.pdf Handbook of Mineralogy]</ref><ref name=Mindat>[http://www.mindat.org/min-3994.html Mindat.org]</ref><ref name=Webmin>[http://webmineral.com/data/Tongbaite.shtml Webmineral data]</ref>
}}

'''Tongbaite''' is a rare mineral that has the chemical formula Cr<sub>3</sub>C<sub>2</sub>, or [chromium carbide](/source/chromium_carbide).

It was first described in 1983 for an occurrence in Liu village, [Tongbai County](/source/Tongbai_County) (桐柏县), [Henan Province](/source/Henan_Province), [China](/source/China) and named for the locality.<ref name=Mindat/> It occurs in an [ultramafic](/source/ultramafic) rock deposit.<ref name=HBM/>  It has also been found in the [Tibet Autonomous Region](/source/Tibet_Autonomous_Region) and the [Isovsky District](/source/Isovsky_District), in the [Urals](/source/Urals) of Russia.<ref name=Mindat/>

==References==
{{Reflist}}

Category:Carbide minerals
Category:Chromium minerals
Category:Orthorhombic minerals
Category:Minerals in space group 62
Category:Minerals described in 1983

{{Mineral-stub}}

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