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Northwest Africa 13859
Basic information Name: Northwest Africa 13859
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13859
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 2.05 kg
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 241 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 6 May 2021
Writeup from MB 110:

Northwest Africa 13859 (NWA 13859)

Northwest Africa

Purchased: 2021 Mar

Classification: Lunar meteorite (feldspathic breccia)

History: The meteorite was purchased by Said Yousfi from a dealer in Temara, Morocco. The largest second largest 356 g fragment was subsequently acquired by Luca Cableri. One sample was analyzed by Ansgar Greshake at MNB and a second sample by Paul Carpenter at WUSL.

Physical characteristics: Several dark grayish fragments without fusion crust. The largest ones weighing 694 g, 356 g, 283 g, 283 g, and 99 g, respectively, without fusion crust.

Petrography: Feldspathic breccia composed of mineral clasts and sparse troctolitic lithic clasts set in fine grained, partly glassy matrix. Minerals are predominantly plagioclase and olivine suggesting presence of abundant troctolitic material throughout the meteorite; pyroxenes are rare. Accessory phases are: FeS, ilmenite, Ti-bearing chromite, and secondary barite and calcite.

Geochemistry: (A. Greshake, MNB) zoned olivine: Fa20.8±6.4 (Fa14.6-30.9, FeO/MnO=83±8, n=13); homogeneous olivine: Fa17.7±0.1, FeO/MnO=84±10, n=4; plagioclase: An96.6±0.8 (An95.3-97.6, n=6); (P. Carpenter, WUSL) olivine: Fa19.3-57.4, FeO=82-106, n=8; low-Ca pyroxene: Fs38.2Wo2.1, FeO/MnO=64, n=1); pigeonite: Fs17.7-24.2Wo7.4-15.0, FeO/MnO=42-54, n=3; augite: Fs16.9Wo39.4, FeO/MnO=45, n=1; plagioclase: An94.4-96.6Ab3.4-5.5Or0.0-0.1, n=3.

Classification: Lunar (feldspathic breccia, troctolite-rich).

Specimens: 20.5 g and a polished thin section are at MNB; 1 g and a polished mount are at UWB; main mass with Said Yousfi.

Data from:
  Table 0
  Line 0:
Place of purchase:Temara, Morocco
Date:P 2021 Mar
Mass (g):2045
Class:Lunar (feldsp. breccia)
Shock stage:high
Weathering grade:low
Fayalite (mol%):20.8; 17.7; 19.3-57.4
Ferrosilite (mol%):38.2; 17.7-24.2; 16.9
Wollastonite (mol%):2.1; 7.4-15.0; 39.4
Classifier:A. Greshake, MNB, A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.5; 1
Type spec location:MNB; UWB
Main mass:Said Yousfi
Comments:Work names SY#57, SY#84; submitted by Ansgar Greshake
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
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)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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