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Northwest Africa 13179 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13179 This is an OFFICIAL meteorite name. Abbreviation: NWA 13179 Observed fall: No Year found: 2019 Country: Algeria Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 3 approved meteorites classified as Martian. [show all] Search for other: Martian meteorites | ||||||||||||||||||||||||||||||
Comments: | Approved 5 Apr 2020 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 109:
Northwest Africa 13179 (NWA 13179) Algeria 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: MB109 Table 0 Line 0: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||||
Institutions 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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:![]() |
Statistics: This is 1 of 1306 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters) |