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Northwest Africa 15861
Basic information Name: Northwest Africa 15861
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15861
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 82.9 g
Meteoritical Bulletin:  MB 112  (2023)  Angrite
Recommended:  Angrite    [explanation]

This is 1 of 53 approved meteorites classified as Angrite.   [show all]
Search for other: Achondrites, Angrites
Comments: Approved 10 Jun 2023
Writeup from MB 112:

Northwest Africa 15861 (NWA 15861)

(Northwest Africa)

Purchased: 2022 Feb

Classification: Angrite

History: Purchased by Luc Labenne in February 2022 from a dealer in Ouarzazate, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The specimen is an annealed breccia composed predominantly of angular mineral clasts plus subordinate lithic clasts (at least one itself a breccia with similar mineralogy). Major minerals are Al-Ti augite, Ca-bearing olivine and anorthite accompanied by accessory Cr-bearing hercynite, rhönite, ulvöspinel (enclosed by rhönite), troilite, merrillite and rare taenite.

Geochemistry: Olivine (Fa50.3-51.8Ln1.6-1.9, FeO/MnO = 76-85, N = 10), Al-Ti-augite (Fs12.3-13.7Wo50.6-57.8, FeO/MnO = 77-138, Al2O3 6.5-13.4 wt.%, TiO2 0.9-3.2 wt.%, N = 10), augite (Fs12.8-13.1Wo51.8-51.1, FeO/MnO = 79-103, Al2O3 2.7-3.9 wt.%, TiO2 0.4-0.6 wt.%, N = 3), anorthite (An99.3-99.7Or0.0-0.1, N = 7). Oxygen isotopes (K. Ziegler, UNM): analysis of acid-washed subsamples by laser fluorination gave, respectively δ17O 2.310, 2.008, 2.219; δ18O 4.588, 4.044, 4.479; Δ17O -0.112, -0.127, -0.146 per mil (all data linearized).

Classification: Angrite (breccia).

Specimens: 16.6 g including a polished mount and polished slice at UWB; remainder with Labenne.

Data from:
  Table 0
  Line 0:
Place of purchase:Ouarzazate
Date:P 2022 Feb
Mass (g):82.9
Shock stage:low
Weathering grade:low
Fayalite (mol%):50.3-51.8
Ferrosilite (mol%):12.3-13.7
Wollastonite (mol%):50.6-57.8
Classifier:(A. Irving, UWS, and P. Carpenter, WUSL)
Type spec mass (g):16.6
Type spec location:UWB
Main mass:Labenne
Comments:Work name ME-OB1; submitted by A. Irving
Plots: O isotopes:  
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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     This is 1 of 9765 approved meteorites from (Northwest Africa) (plus 1865 unapproved names)

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