Lunar Meteorite: Shişr 166

Oman

  

  

   Shişr 166 in the desert and on display
(photos courtesy of Luc Labenne)

  

Shişr 166 has vesicles, some of which are now filled with carbonate and sulfate minierals from terrestial weathering.
(photos by Randy Korotev)

Photomicrograph of a thin section of Shişr 166.
(photo by Axel Wittmann)



It's the only lunar meteorite to have been found at night!


It is compositionally indistiguishable from Dhofar 026 and its pair Dhofar 457–468, but Shisr 166 is distinctly different in texture
.

  

from The Meteoritical Bulletin, No. 98, Meteoritics & Planetary Science 45, 1530–1551 (2010)

Shişr 166

Zufar, Oman
Found: 10 Apr 2008

Lunar (feldspathic melt breccia)

History: One stone was found by Luc Labenne in the desert at night.

Physical characteristics: The 128.8-g meteorite lacks an obvious fusion crust. The interior consists of a gray, vesicular (up to 1.2 mm vesicles) melt matrix with rounded clasts stained red by hematite. Many vesicles are filled with terrestrial alteration products, including calcite, Ca-sulfate, and celestite.

Petrography: (R. Zeigler, WUSL) Melt matrix dominated by plagioclase (average: An96.7Or0.2) with intergrown of pigeonite (average Fs50Wo27; Fe/Mn = 57), augite (Fs60Wo27; Fe/Mn = 48), and olivine (Fo61; Fe/Mn = 102) in an apparent poikilitic texture. Also present within the matrix are small grains of troilite, Cr,Ti,Fe spinel (19 wt% TiO2, 25 wt% Cr2O3 , 23 wt% FeO), and ilmenite (5 wt% MgO, 1.5 wt% Cr2O3), the latter two often intergrown. There are a few plagioclase clasts (typically 0.2 mm, up to ~1 mm) and a few smaller olivine and pyroxene clasts. Large veins of partially devitrified shock melt occur. Average composition of the shock-melt vein: 43.7% SiO2, 0.24% TiO2, 29.7% Al2O3, 4.3% FeO, 0.07% MnO (Fe/Mn = 63), 4.0% MgO (Mg´ = 63), 16.8% CaO, 0.32 wt% Na2O, and 0.03 wt% K2O.

Geochemistry: Bulk Chemistry: (R. Korotev, WUSL): 0.32% Na2O, 4.1% FeO, 7.9 ppm Sc, 140 ppm Ni, 1.2 ppm Sm.

Classification: Achondrite (lunar, impact-melt breccia).

Specimens: 20.1 g are on deposit at WUSL, the main mass is held by Labenne.


More Information

Meteoritical Bulletin Database

Shişr 166

Map

Schematic Map of the Find Locations of the Dhofar Lunar Meteorites

References

Bouvier A., Wadhwa M., Korotev R. L., and Hartmann W. K. (2011) U-Pb chronology of two lunar impact melt breccias (abstract). 74th Annual Meeting of the Meteoritical Society, abstract no. 5185. Lunar and Planetary Institute.

Korotev R. L. (2012) Lunar meteorites from Oman. Meteoritics & Planetary Science 47, 1365–1402. doi: 10.1111/j.1945-5100.2012.01393.x

Korotev R. L., Irving A. J., and Bunch T. E. (2012) Keeping Up With the Lunar Meteorites — 2012 (abstract). In Lunar and Planetary Science XLIII, abstract no. 1152, 43rd Lunar and Planetary Science Conference.

Korotev R. L and Irving A. J. (2013) Keeping up with the lunar meteorites - 2013 (abstract). In Lunar and Planetary Science XLIV, abstract no. 1216, 44th Lunar and Planetary Science Conference.


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Prepared by:

Randy L. Korotev


Department of Earth and Planetary Sciences
Washington University in St. Louis


Please don't contact me about the meteorite you think you've found until you read this and this.

e-mailkorotev@wustl.edu

Last revised: 11-Aug-2014