Meteoritical Bulletin: Entry for Northwest Africa 15861

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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: 82.9 g

Classification
history:

Meteoritical Bulletin:	MB 112	(2024)	Angrite
Recommended:			Angrite [explanation]

This is 1 of 54 approved meteorites classified as Angrite. [show all]
Search for other: Achondrites, Angrites

Comments:

Approved 10 Jun 2023

Writeup

help

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 (Fa_50.3-51.8Ln1.6-1.9, FeO/MnO = 76-85, N = 10), Al-Ti-augite (Fs_12.3-13.7Wo_50.6-57.8, FeO/MnO = 77-138, Al₂O₃ 6.5-13.4 wt.%, TiO₂ 0.9-3.2 wt.%, N = 10), augite (Fs_12.8-13.1Wo_51.8-51.1, FeO/MnO = 79-103, Al₂O₃ 2.7-3.9 wt.%, TiO₂ 0.4-0.6 wt.%, N = 3), anorthite (An_99.3-99.7Or_0.0-0.1, 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:
  MB112
  Table 0
  Line 0:

Place of purchase:	Ouarzazate
Date:	P 2022 Feb
Mass (g):	82.9
Pieces:	1
Class:	Angrite
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:

Institutions
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)

Catalogs:

References:

Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Cartier C., Consolmagno G., Goodrich C., Greshake A., Gross J., Joy K. H., Miao B. and Zhang B. (2024) The Meteoritical Bulletin, no. 112. Meteoritics & Planetary Science 59, 1820–1823. ?

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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