Graves Nunataks 06157
samples of GRA 06157. Millimeter ticks for scale.
credit: Randy Korotev)
electron image (gray-scale) and a red-green-blue elemental x-ray map of a
thin section of GRA 06157. In BSE images, brightness increases with mean
atomic mass. The darkest areas are rich in plagioclase (Al) and the
lightest areas are rich in mafic (Fe-bearing) minerals. In the X-ray map,
areas rich in Al (e.g., plagioclase) are bright red, areas rich in Mg are
bright green (e.g., olivine), and areas rich in Fe (e.g., pyroxene or FeNi
metal) are bright blue. The scale bar applies to the BSE image.
credit: Ryan Zeigler)
Meteoritical Bulletin, No. 94, September 2008. Meteoritics & Planetary Science
Vol. 30, No. 2, 2007
No.: GRA 06157
Location: Graves Nunataks
Field No.: 17724
Dimensions (cm): 1.0 x 1.0 x 0.5
Mass: 0.788 g
Kathleen McBride. The exterior has no fusion crust and is a gray color with
white and cream colored clasts. The interior is a
gray matrix with white clasts throughout.
Thin Section (,2)
Description: Tim McCoy, Lauren LaCroix
and Linda Welzenbach. The section shows a
groundmass of comminuted pyroxene, olivine and plagioclase with grain sizes
up to 1 mm. One-half of the section exhibits a darkened matrix. Olivine is
Fa7-54, pyroxene ranges from Fs19-66Wo2-45
(Fe/Mn ~ 60), and plagioclase An94-97. The meteorite is lunar,
probably an anorthositic regolith breccia.
0.79 g, it’s the smallest named lunar meteorite.
ANSMET Location Map
Korotev R. L. and Zeigler R.
A. (2014) Chapter 6. ANSMET Meteorites from the Moon, Thirty-five Seasons of U.S. Antarctic Meteorites
(1976–2010): A Pictorial Guide to the Collection (editors K. Righter, R. P.
Harvey, C. M. Corrigan, and T. J. McCoy), 101–130, Special Publications 68,
American Geophysical Union, Washington, D. C., 296 pages, ISBN:
Korotev R. L., Irving A. J.,
and Bunch T. E. (2008) Keeping up with the lunar meteorites - 2008. Lunar
and Planetary Science XXXIX, abstract no. 1209, 39th
Lunar and Planetary Science Conference.
Korotev R. L., Jolliff B. L.,
and Zeigler R. A. (2010) On the origin of the moon’s feldspathic
highlands, pure anorthosite, and the feldspathic lunar meteorites. 41st
Lunar and Planetary Science Conference, abstract no. 1440.
Zeigler R. A., Korotev R. L.,
and Jolliff B. J. (2012) Feldspathic lunar meteorite Graves Nunataks
06157, a magnesian piece of the lunar highlands crust. Second
Conference on the Lunar Highlands Crust, abstract no. 9033.
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