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Northwest Africa 13885
Basic information Name: Northwest Africa 13885
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13885
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 2.61 kg
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 298 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 6 May 2021
Writeup from MB 110:

Northwest Africa 13885 (NWA 13885)


Find: 2020

Classification: Martian meteorite (Shergottite)

History: Found in December 2020 by meteorite hunters in who meandered from the Erg Chech 002 strewn field in Algeria. The specimen was later acquired by Darryl Pitt.

Physical characteristics: A single curvilinear mass with patches of fusion crust in evidence on a smoothly textured greenish-hued surface accented throughout by the stippling of black grains. Saw-cut surface reveals a porphyritic texture with orange-brown olivine phenocrysts set in a light green-brown groundmass. The deposit sample slice displayed a prominent, dark colored, shock melt vein.

Petrography: (C. Agee, UNM) This meteorite has the approximate modal abundances: 45% pyroxene, 30% olivine, 20% maskelynite, with accessory ilmenite, chromite, and troilite. Pyroxenes exhibit normal igneous zoning with patches of pigeonite and augite within single grains. Olivine phenocrysts are typically 1-3 mm in size. Pyroxene grains are often finer-grained but form cumulate masses as well. Maskelynite domains are usually seen as subhedral laths with typical dimensions of 100 × 500 μm.

Geochemistry: (C. Agee, UNM) Olivine Fa45.0±3.4, Fe/Mn=53±3, CaO=0.23±0.07, (wt%), n=5; pyroxene Fs27.8±4.6Wo15.6±10.6, Fe/Mn=30±2, n=20; maskelynite An60.1±1.3Ab39.2±1.4Or0.7±0.2, n=6.

Classification: Martian shergottite (olivine phyric basalt)

Specimens: 20 g on deposit at UNM, Darryl Pitt holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Mass (g):2610
Class:Martian (shergottite)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):45.0±3.4
Ferrosilite (mol%):27.8±4.6
Wollastonite (mol%):15.6±10.6
Classifier:C. Agee, UNM
Type spec mass (g):20
Type spec location:UNM
Main mass:DPitt
Comments:Submitted by C. Agee
   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)
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., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 1294 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)

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