Pyroxene pallasite grouplet

{{Short description|Subdivision of pallasite meteorites}}

{{infobox meteorite subdivision

|Subdivision = Grouplet

|Name = Pyroxene pallasite grouplet

|Alternative_names =

|Image =

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|Type = Stony-iron

|Class = Pallasite

|Clan =

|Structural_classification =

|Parent_body =

|Composition = Meteoric iron, silicate minerals (pyroxene)

|Petrologic_type =

|Number_of_specimens = 2

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}}

The pyroxene pallasite grouplet is a subdivision of the pallasite meteorites (stony-irons).{{cite book|editor=D. S. Lauretta |editor2=H. Y. McSween, Jr.|title=Meteorites and the early solar system II|year=2006|publisher=University of Arizona Press|location=Tucson|isbn=978-0816525621|chapter-url=http://haroldconnolly.com/EES%20716%20Fall%2009%20Reading/Lecture%201/Background%20reading/Weisberg_etal_MESSII.pdf|author=M. K. Weisberg|author2=T. J. McCoy, A. N. Krot|access-date=15 December 2012|pages=19–52|chapter=Systematics and Evaluation of Meteorite Classification}}

The grouplet is named "pyroxene pallasites" because they are the only pallasites that contain pyroxene. The grouplet was proposed in 1995.{{cite journal|last=Boesenberg|first=Joseph S.|author2=Davis, Andrew M. |author3=Prinz, Martin |author4=Weisberg, Michael K. |author5=Clayton, Robert N. |author6= Mayeda, Toshiko K. |author6-link= Toshiko Mayeda |title=The pyroxene pallasites, Vermillion and Yamato 8451: Not quite a couple|journal=Meteoritics & Planetary Science|date=1 July 2000|volume=35|issue=4|pages=757–769|doi=10.1111/j.1945-5100.2000.tb01460.x|doi-access=free}} It currently has only two members: the Vermillion and Yamato 8451 meteorite. Both meteorites contain pyroxene and have a number of other similarities: for example their pyroxene composition, rare-earth element concentrations, and oxygen isotope ratios. However, there are also indicators against the grouping of these two meteorites: for example the texture and occurrence of cohenite in the Vermillion meteorite and the differing siderophile trace element concentrations.