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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 284 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 Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 1223 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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