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Northwest Africa 14879
Basic information Name: Northwest Africa 14879
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14879
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 5.58 kg
Recommended:  Achondrite-ung    [explanation]

This is 1 of 128 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 29 Jan 2023
Writeup from MB 112:

Northwest Africa 14879 (NWA 14879)

(Northwest Africa)

Purchased: 2019 Jul

Classification: Ungrouped achondrite

History: Purchased by Darryl Pitt in July 2019 from a dealer in Erfoud, Morocco.

Physical characteristics: Slices of this specimen reveal that the interior consists of somwhat rounded, coarser grained, khaki-colored regions (up to 1.5 cm across) interspersed with much finer grained, dark brown regions (~30 vol.%).

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Coarse grained regions or clasts have protogranular texture (mean grainsize ~0.25 mm) and consist predominantly of forsterite and enstatite with accessory diopside, altered Si-bearing kamacite, graphite and a Cr-bearing FeNiP phase. The much finer grained, interstitial regions, which appear to have engulfed portions of the coarser grained lithology, are composed predominantly of finely-exsolved, highly magnesian pyroxene. Sulfides are absent, but secondary calcite, anhydrite and Fe oxides are present

Geochemistry: Forsterite (Fa0.5-1.0, FeO/MnO = 2-4, N = 4), enstatite (Fs0.3-1.2Wo0.8-1.2, FeO/MnO = 1-3, N = 4), subcalcic diopside (Fs1.2Wo33.0, FeO/MnO = 7, Al2O3 1.6 wt.%), metal (Ni 5.0±0.0 wt.%, Si 1.6-2.6 wt.%, N = 3). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O 1.553, 1.581; δ18O 6.415, 6.519; Δ17O -1.835, -1.861 per mil (all data linearized).

Classification: Achondrite (ungrouped, magnesian). Paired with NWA 11562 and NWA 12969 based on essentially identical and distinctive textures, mineral compositions and oxygen isotopes.

Specimens: 64.6 g including one polished thin section and a polished endcut at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2019 Jul
Mass (g):5580
Shock stage:high
Weathering grade:low
Fayalite (mol%):0.5-1.0
Ferrosilite (mol%):0.3-1.2; 1.2
Wollastonite (mol%):0.8-1.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):64.6
Type spec location:UWB
Main mass:DPitt
Comments:Work name MVCH 631; 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. 112, in preparation (2023)
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     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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