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Yamato 790007 | |||||||||||||
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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: 80.4 g | ||||||||||||
Classification history: |
This is 1 of 407 approved meteorites classified as Eucrite-pmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||
Writeup |
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. | ||||||||||||
Catalogs: |
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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: |
Statistics: This is 1 of 44400 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||
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Revision history: |
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