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Northwest Africa 12004
Basic information Name: Northwest Africa 12004
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12004
Observed fall: No
Year found: 2018
Country: Morocco
Mass:help 183 g
Meteoritical Bulletin:  MB 107  (2018)  Angrite
Recommended:  Angrite    [explanation]

This is 1 of 53 approved meteorites classified as Angrite.   [show all]
Search for other: Achondrites, Angrites
Comments: Approved 27 Oct 2018
Writeup from MB 107:

Northwest Africa 12004 (NWA 12004)


Purchased: 2018 Mar

Classification: Angrite

History: Found near Touignin in southern Morocco and purchased by Ben Hoefnagels in March 2018 from a Moroccan dealer.

Physical characteristics: A gray stone (183 g) lacking fusion crust and with visible sparse vesicles.

Petrography: (A. Irving and S. Kuehner, UWS) Diabasic texture (mean grainsize 0.5 mm) with sparse vesicles. Major minerals are zoned calcic olivine (with kirschsteinite rims), zoned Al-Ti-augite and anorthite, together with accessory titanomagnetite, troilite, silicoapatite and ferroan rhönite.

Geochemistry: Olivine (Fa36.6-84.1Ln1.4-15.4, FeO/MnO = 70-95, N = 7), clinopyroxene (Fs20.9-46.7Wo52.0-52.9, FeO/MnO = 77-148, TiO2 = 1.4-4.2 wt.%, Al2O3 =7.3-11.6 wt.%, N = 5), kirschsteinite (Fa62.4Ln33.8, FeO/MnO = 69), anorthite (An99.5-99.6Ab0.3Or0.0, N = 2). Oxygen isotopes (K. Ziegler, UNM) Analyses of acid-washed subsamples by laser fluorination gave, respectively δ17O 2.258, 2.197, 2.285; δ18O 4.440, 4.284, 4.431; Δ17O -0.086, -0.065, -0.055 per mil.

Classification: Angrite (diabasic).

Specimens: 22.3 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2018 Mar
Mass (g):183
Shock stage:low
Weathering grade:low
Fayalite (mol%):36.6-84.1
Ferrosilite (mol%):20.9-46.7
Wollastonite (mol%):52.0-52.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):22.3
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH140; 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)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 2089 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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