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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
Meteoritical Bulletin:  MB 111  (2023)  Angrite
Recommended:  Angrite    [explanation]

This is 1 of 53 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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     This is 1 of 1376 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)

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