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Yamato 790007
Basic information Name: Yamato 790007
     This is an OFFICIAL meteorite name.
Abbreviation: Y-790007
Observed fall: No
Year found: 1979
Country: Antarctica [Collected by National Institute of Polar Research, Japan]
Mass:help 80.4 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-790007, 91-2: Eucrite

         A polymict HED breccia with several lithic clasts and mineral fragments set in a dark comminuted matrix. Lithic clast types include dark devitrified glass, eucritic clast with lath-shaped phenocrysts of pyroxene with variolitic matrix of plagioclase and pyroxene equigranular eucrites with dusty brownish pyroxene and plagioclase.

         The PTS, 91-1 is different from the above PTS in that it has abundant fragments of inverted pigeonite with blebby exsolved augites like that of pyroxene cumulate eucrite Binda. Their host composition Ca3Mg64Fe33 is identical to those in Binda. In addition to many fragments of inverted pigeonite, there is a clast of this cumulate eucrite, in which an inverted pigeonite and a plagioclase are in direct contact, exhibiting a coarse-grained crystalline texture. The composition of the plagioclase is the most calcic (An94) among those found in polymict eucrites. Small fragments of pyroxene as Mg-rich as that in diogenites were rarely detected. Pigeonites with fine exsolution lamellae similar to those in ordinary eucrites (e.g. Juvinas) were occasionally found, but no clast of such rock has been detected. In spite of the predominance of the slowly-cooled eucrite components, this breccia contains rounded vitric clasts with radiating feathery phenocrysts. The largest vitric clast is 6 mm in the longest dimension. A few basaltic clasts with an ophitic texture were found. Their pyroxenes show chemical zoning and their plagioclase is more Na-rich than the cumulate eucrite ones.

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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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