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Northwest Africa 11077
Basic information Name: Northwest Africa 11077
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11077
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 1140 g
Meteoritical Bulletin:  MB 106  (2018)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 276 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 17 Feb 2017
Writeup from MB 106:

Northwest Africa 11077 (NWA 11077)

(Northwest Africa)

Purchased: 2016 Nov

Classification: Lunar meteorite (feldspathic breccia)

History: Purportedly found near Adrar, Algeria in October 2016, and purchased by Darryl Pitt in November 2016 from a dealer in Mauritania.

Physical characteristics: A single medium gray stone (1139.7 g) lacking fusion crust but exhibiting a shiny desert patina on exterior surfaces. Very sparse, small whitish clasts are visible within a dominant very fine grained, vesicular matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Extremely fine-grained breccia consisting mainly of very tiny mineral grains plus devitrified glass (some with swirly texture visible in thin section) plus sparse lithic clasts, which are themselves melt rocks with intersertal texture and sparse relict clasts. Minerals large enough to be quantitatively analyzed are anorthite, olivine and subcalcic augite; accessory minerals include kamacite, troilite and minor barite.

Geochemistry: Olivine (Fa15.9-39.7, FeO/MnO = 73-77, N = 4), subcalcic augite (Fs20.1Wo34.1, FeO/MnO = 40), plagioclase (An96.1-96.8Or0.3-0.1, N = 2). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 3.7, Na2O 0.40; (in ppm) Sc 7.4, Ni 160, La 3.1, Sm 1.45, Eu 0.80, Yb 1.1, Lu 0.15, Hf 1.1, Th 0.41. Magnetic susceptibility log χ (× 10-9 m3/kg) = 2.38.

Classification: Lunar (feldspathic vitric regolith breccia).

Specimens: 21.7 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2016 Nov
Mass (g):1139.7
Class:Lunar (feldsp. breccia)
Shock stage:low
Weathering grade:low
Fayalite (mol%):15.9-39.7
Ferrosilite (mol%):20.1
Wollastonite (mol%):34.1
Magnetic suscept.:2.38
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.7
Type spec location:UWB
Main mass:DPitt
Comments:MVCH 225; submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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