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Northwest Africa 13179
Basic information Name: Northwest Africa 13179
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13179
Observed fall: No
Year found: 2019
Country: Algeria
Mass:help 175 g
Meteoritical Bulletin:  MB 109  (2021)  Martian
Recommended:  Martian    [explanation]

This is 1 of 3 approved meteorites classified as Martian.   [show all]
Search for other: Martian meteorites
Comments: Approved 5 Apr 2020
Writeup from MB 109:

Northwest Africa 13179 (NWA 13179)


Purchased: 2019 Aug

Classification: Martian meteorite

History: Purchased by Ben Hoefnagels in July 2019 from a dealer in Zagora, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Medium grained (mean grainsize ~0.7 mm) assemblage of predominantly pyroxenes with subordinate subhedral, compositionally-zoned olivine (~15 vol.%) and minor (~5 vol.%) interstitial maskelynite (as bundles of thin laths). Accessory phases include chromite, Ti-chromite, pyrrhotite, pentlandite, ilmenite, silica polymorph and merrillite. Pyroxene grains have prominent orthopyroxene cores mantled by pigeonite and subcalcic augite.

Geochemistry: Olivine (cores Fa17.7-21.6, rims Fa25.5-30.3, FeO/MnO = 44-50, N = 4), orthopyroxene cores (Fs14.7-14.9Wo1.2-1.4, FeO/MnO = 28-30, N = 3), pigeonite rims (Fs20.5-44.2Wo4.0-12.6, FeO/MnO = 29-36, N = 4), subcalcic augite (Fs34.9Wo28.4, FeO/MnO = 35), maskelynite (An65.9-69.6Or0.3-0.2, N = 2). O isotopes measured by K. Ziegler at UNM on two acid-washed aliquots of sample: δ17O 2.799, 2.801; δ18O 4.719, 4.690; Δ17O 0.308, 0.325 per mil.

Classification: Martian (ultramafic, olivine microwebsterite). This specimen is ultramafic based on the paucity of plagioclase (maskelynite), a micropyroxenite based on its mean grainsize, and an olivine websterite based on the proportions of olivine, orthopyroxene and clinopyroxene.

Specimens: 20.4 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2019 Aug
Mass (g):175
Shock stage:high
Weathering grade:low
Fayalite (mol%):17.7-30.3
Ferrosilite (mol%):14.7-14.9; 20.5-44.2
Wollastonite (mol%):1.2-1.4; 4.0-12.6
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.4
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH212; 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)
References: Published in Gattacceca J., McCubbin F. M., Grossman J., Bouvier A., Bullock E., Chennaoui Aoudjehane H., Debaille V., D’Orazio M., Komatsu M., Miao B. and Schrader D. L. (2021) The Meteoritical Bulletin, No. 109. Meteoritics & Planetary Science 56, 1626–1630.
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     This is 1 of 1374 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)

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