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Yamato 790020
Basic information Name: Yamato 790020
     This is an OFFICIAL meteorite name.
Abbreviation: Y-790020
Observed fall: No
Year found: 1979
Country: Antarctica [Collected by National Institute of Polar Research, Japan]
Mass:help 86.3 g
Classification
  history:
NHM Catalogue:  5th 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-790020, 80-2: Eucrite

         Flat stone with one side preserving black shiny fusion crust. Two lithic clasts with ophitic textures 1cm in diameter are seen on the broken surface. Polymict eucrite.

         A polymict HED breccia with abundant subophitic eucritic clasts including pyroxene with colorless core and brown rims and dark mesostasis. Mineral fragments are angular and are set in a more comminuted materials. Large pyroxene fragments include fragments with fine blebby augite. Binda-like inverted pigeonite, Moore County type pyroxene with coarse exsolution lamellae on (001) and Juvinas-type with fine exsolution lamellae.

         The PTS, 80-1 is characterized by an occurrence of a partly inverted pigeonite, 0.5 mm in diameter, with coarse exsolution lamellae of augite Ca40Mg41Fe19 with (001) in common with the host pyroxene Ca3Mg59Fe38. It is similar to partly inverted pigeonite from Moore County. Small fragments of this type are also found in the matrix. Inverted pigeonites with blebby inclusions (Binda type) have not been detected in PTS, 80-1, but a lithic clast with pyroxene Ca2.8Mg63.7Fe33.5 and plagioclase An93.4 is present. The most Mg-rich pyroxene has a composition Ca4.2Mg70.0Fe25.8. Basaltic clasts with pyroxene showing chemical zoning are similar to those found in Y-75011 clast.

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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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