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{{Infobox meteorite
|Name= Tonk
|Image=
|Image_caption=
|Type= [[Chondrite]]
|Class= [[Carbonaceous chondrite]]
|Group= CI1
|Structural_classification=
|Composition=
|Shock=
|Weathering=
|Country= [[India]]
|Region= [[Rajasthan]]
|Lat_Long= {{coord|24|39|N|76|52|E|display=inline,title}}<ref name=metbulldb>{{metbull|24026|Tonk}}</ref>
|Observed_fall= Yes
|Fall_date= 22 January 1911
|Found_date=
|TKW= {{convert|7.7|g|oz|abbr=on}}
|Image2= Météorite Alais, exposition Météorites, Muséum national d'histoire naturelle de Paris.jpg
|Image2_caption= The similar Alais meteorite in 2018
}}
'''Tonk''' is a small [[carbonaceous chondrite]] [[meteorite]] that fell near [[Tonk, India]] in 1911. Despite its small size, it is often included in studies due to its compositional similarity to the early solar system.

==Composition and classification==
The meteorite consists of fragments that together weigh {{convert|7.7|g|oz|abbr=on}} and fell near the city of [[Tonk, India|Tonk]] in India near midday on 22 January 1911.<ref>{{cite journal | last=Christie | first=W. A. K. | year=1914 | title=The composition of the Tonk Meteorite | journal=The Journal of the Astronomical Society of India | volume=4 | number=2 | pages=71–72}}</ref> It is one of five known meteorites belonging to the [[CI chondrite]] group.<ref>{{cite journal | last=Mason | first=Brian | title=The Carbonaceous Chondrites | journal=Space Science Reviews | year=1963 | volume=1 | number=4 | pages=621–646 | doi=10.1007/BF00212446 | bibcode=1963SSRv....1..621M | s2cid=121308917 }}</ref> This group is remarkable for having an elemental distribution that has the strongest similarity to that of the [[solar nebula]]. Except for certain volatile elements, like carbon, hydrogen, oxygen, nitrogen and the noble gases, which are not present in the meteorite, the ratios of the elements are very similar.<ref name=meteoritics>{{cite journal | last1=Endress | first1=Magnus | last2=Spettel | first2=Bernhard | last3=Bischoff | first3=Adolf | year=1994 | title=Chemistry, petrography, and mineralogy of the Tonk CI chondrite: Preliminary results | journal=Meteoritics | volume=29 | number=4 | pages=462–463| bibcode=1994Metic..29..462E }}</ref> Notably though, the meteor is highly enriched in volatile mercury which is undetectable in the solar photosphere, and this is a major driver of the "mercury paradox" that mercury abundances in meteors do not follow its volatile nature and isotopic ratios based expected behaviour in the solar nebula.<ref>{{cite journal | last1=Lauretta | first1=D.S. | last2=Devouard | first2=B. | last3=Buseck | first3=P.R. | year=1999 | title=The cosmochemical behavior of mercury | journal=Earth and Planetary Science Letters | volume=171 | issue=1 | pages=35–47| doi=10.1016/S0012-821X(99)00129-6 | bibcode=1999E&PSL.171...35L }}</ref><ref>{{cite journal | last1=Meier | first1=M.M.M. | last2=Cloquet | first2=C. | last3=Marty | first3=B. | year=2015 | title=Mercury (Hg) in meteorites: Variations in abundance, thermal release profile, mass-dependent and mass-independent isotopic fractionation | journal=Geochimica et Cosmochimica Acta | volume=182 | pages=55–72| doi=10.1016/j.gca.2016.03.007 | doi-access=free }}</ref> These features mean that it is often, despite its small size, included in meteorological studies. The meteorite contains [[Dolomite (mineral)|dolomite]], [[magnesite]], [[magnetite]], [[pentlandite]] and [[pyrrhotite]].<ref name=meteoritics/>

==Alternative names==
The meteorite is also known as Chhabra and Jhalrapatan.<ref name=metbulldb/>

==See also==
* [[Glossary of meteoritics]]

==References==
{{Reflist}}

{{Meteorites by name}}

{{Authority control}}

[[Category:Astrobiology]]
[[Category:Meteorites found in India]]
[[Category:Geology of Rajasthan]]

Tonk meteorite - Revision history

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