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Yamato 790122
Basic information Name: Yamato 790122
     This is an OFFICIAL meteorite name.
Abbreviation: Y-790122
Observed fall: No
Year found: 1979
Country: Antarctica [Collected by National Institute of Polar Research, Japan]
Mass:help 109.5 g
Classification
  history:
NHM Catalogue:  5th Edition  (2000)  Eucrite-pmict
NIPR Catalogue:  2000 Edition  (2000)  Eucrite-pmict
MetBase:  v. 7.1  (2006)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 349 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from MN J6(1):

Y-790122, 80-1: Eucrite

         Two sides of the meteorite are broken, and one side is covered with black fusion crust. It is a polymict eucrite with abundant crystalline clasts. Some basaltic clasts show laths of plagioclase and others are brown to dark brown coarse lithic clasts about 1cm in diameter.

         The PTS, 80-1 consists of four different clasts ranging in size from 2 mm to 4.5 mm, with narrow veins of brecciated matrix between them. S: A medium-grained subophitic basalt with dark troilite-rich mesostasis contains chemically zoned pyroxenes; I: A very fine-grained subophitic to intersertal basalt with slightly zoned pigeonites (Ca12Mg38Fe50) and plagioclase (An89); E: A coarse-grained equigranular clast with slightly zoned pigeonites; A: An aphanitic clast includes subrounded fine-grained pyroxene Ca14Mg35Fe51 and plagioclase clasts (An89-An93) in a dark matrix. No inverted pigeonite from cumulate eucrites is found in the matrix. This polymict eucrite is a clast-rich type. The chemical compositions of pyroxenes in the matrix and the four different clasts are different.

         Pyroxenes in clast E look like that of some eucrites, but they show slight compositional zoning and their bulk chemical composition is slightly Mg-rich than those in the ordinary eucrites.

Catalogs:
Search for this meteorite in the NIPR database (Japan):   
References: Published in Meteorites news : Japanese collection of Antarctic meteorites /Meteorites news : Japanese collection of Antarctic meteorites ,6(1),1-47 (1996-03)
Never published in the Meteoritical Bulletin
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (71° 30'S, 35° 40'E)
     Recommended::   (71° 30'S, 35° 40'E)

Statistics:
     This is 1 of 40719 approved meteorites from Antarctica (plus 4494 unapproved names)
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