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Yamato 980318
Basic information Name: Yamato 980318
     This is an OFFICIAL meteorite name.
Abbreviation: Y-980318
Observed fall: No
Year found: 1998
Country: Antarctica [Collected by National Institute of Polar Research, Japan]
Mass:help 166.8 g
Classification
  history:
MetBase:  v. 7.1  (2006)  Eucrite-cm
Recommended:  Eucrite-cm    [explanation]

This is 1 of 44 approved meteorites classified as Eucrite-cm.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from MN J10(2):

Sample Name: Yamato 980318

Location: Minami-Yamato Nunataks

Dimensions (cm): 6.9 x 4.7 x 3.8

Weight (g): 166.81

Weathering: B/C

Fracturing: B

Meteorite Type: Eucrite

 

Macroscopic description

This is a subrounded complete stone. 70% of its surface is covered shiny black fusion crust. Exposed interior shows coarse-grained granular texture composed of gray pyroxene and white plagioclase.

 

Petrographic Description (Yamaguchi A.)

The section consists of coarse-grained low-Ca pyroxene and plagioclase (<5 mm) with minor amount of opaque minerals. The low Ca-pyroxene contains exsolution lamellae of augite (~30 μm thick). Pyroxene compositions cluster around Wo2Fs48-49 and Wo45-46Fs18-19. Plagioclase composition is An88-91. This meteorite is a Mg-rich eucrite.

 

Oxygen isotopic composition (δ18O = +3.18, δ17O = +1.36, Δ17O = -0.29) analyzed by

Clayton and Mayeda indicates that this meteorite is an HED.


Writeup from MN J21:

Yamato 980318

Geochemistry: Oxygen isotope composition (R. Clayton and T. Mayeda, UChi): δ18O = 3.18, δ17O = 1.36, Δ17O = -0.29

Plots: O isotopes:  
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References: Published in Meteorite newsletter : Japanese collection of Antarctic meteorites /Meteorite newsletter : Japanese collection of Antarctic meteorites ,10(2),1-9 (2001-12)
Published in Meteorite newsletter : Japanese collection of Antarctic meteorites /Meteorite newsletter : Japanese collection of Antarctic meteorites ,21,1-33 (2012-06)
Never published in the Meteoritical Bulletin
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Geography:

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

Statistics:
     This is 1 of 38937 approved meteorites from Antarctica (plus 5051 unapproved names)
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