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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
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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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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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