|Listed in The Meteoritical Bulletin, No. 94 |
Larkman Nunatak 06638 (LAR 06638)
Location: Larkman Nunatak, Transantarctic Mountains, Antarctica
Classification: Lunar-Anorthositic Breccia
Macroscopic Description: Kathleen McBride The bottom exterior surface has black fusion crust, while the top has a lighter brown crust. Polygonal fractures are present. The gray and white matrix has a sharp line where matrix becomes black with white inclusions.
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. Clasts up to 2 mm include basalts, granulites and anorthosites. One-half of the section exhibits a darkened matrix. Olivine is Fa28-33, pyroxene ranges from Fs27-39Wo3-12 (Fe/Mn ~ 60), and plagioclase An93-98. The meteorite is lunar, probably an anorthositic regolith breccia.
Compositionally, LAR 06638 is a typical feldspathic lunar meteorite.
Meteoritical Bulletin Database
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: 978-1-118-79832-4.
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.
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. and Korotev R. L. (2013) Petrography and geochemistry of feldspathic lunar meteorite Larkman Nunatak 06638. 44th Lunar and Planetary Science Conference, abstract no. 1767.