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Northwest Africa 15317
Basic information Name: Northwest Africa 15317
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15317
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 299 g
Recommended:  Angrite    [explanation]

This is 1 of 43 approved meteorites classified as Angrite.   [show all]
Search for other: Achondrites, Angrites
Comments: Approved 22 Dec 2022
Writeup from MB 111:

Northwest Africa 15317 (NWA 15317)


Purchased: 2021 Oct

Classification: Angrite

History: Purportedly found in Algeria and purchased by Darryl Pitt in October 2021 from a dealer in Agadir, Morocco.

Physical characteristics: A single ellipsoidal stone (299.3 g) about 40% covered by black fusion crust.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Very fresh specimen with porphyritic dendritic texture. Larger grains (up to 1.5 mm) of compositionally-zoned Al-Ti-augite (pink with purple-brown rims in thin section) and Ca-bearing olivine plus smaller laths of anorthite are set within finer grained interstitial regions composed of intergrowths of the same phases plus kirschsteinite, troilite, ulvöspinel, silicoapatite and calcite.

Geochemistry: Olivine (Fa47.7-77.7Ln2.1-8.6, FeO/MnO = 70-90, N = 6), Al-Ti-augite (Fs22.9-47.1Wo50.5-53.2, FeO/MnO = 83-134, Al2O3 5.4-8.7 wt.%, TiO2 1.9-4.7 wt.%, N = 8), kirschsteinite (Fa64.3-81.5Ln33.1-15.3, FeO/MnO = 62-74, N = 4), anorthite (An99.3-99.8Or0.0, N = 4). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O=2.353, 2.457, 2.283; δ18O=4.734, 4.802, 4.529; Δ17O=-0.146, -0.079, -0.108 per mil (all data linearized, TFL slope = 0.528).

Classification: Angrite (medium grained, porphyritic, dendritic).

Specimens: 20.2 g including one polished thin section and one polished slice at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2021 Oct
Mass (g):299.3
Shock stage:low
Weathering grade:low
Fayalite (mol%):47.7-77.7
Ferrosilite (mol%):22.9-47.1
Wollastonite (mol%):50.5-53.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.2
Type spec location:UWB
Main mass:DPitt
Comments:Work name MVCH 634; 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, 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 Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 1306 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)

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