Meteoritical Bulletin: Entry for Yamato 980318

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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: 166.8 g

Classification
history:

MetBase:	v. 7.1	(2006)	Eucrite-cm
Recommended:			Eucrite-cm [explanation]

This is 1 of 55 approved meteorites classified as Eucrite-cm. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Writeup

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

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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 44248 approved meteorites from Antarctica (plus 3802 unapproved names)

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