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Northwest Africa 13965
Basic information Name: Northwest Africa 13965
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13965
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 1720 g
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 29 May 2021
Writeup from MB 110:

Northwest Africa 13965 (NWA 13965)

(Northwest Africa)

Purchased: 2020

Classification: Martian meteorite (Shergottite)

History: Purchased by Jay Piatek from a Moroccan meteorite dealer in 2020.

Physical characteristics: Single stone, broken surface reveals a medium-grained mixture of light gray, light green, orange and white grains.

Petrography: (C. Agee, UNM) SEM mapping gave the following 2-D modal abundances 51% pyroxene, 24.5% olivine, 18% maskelynite, 2.5% oxides, 2.2% carbonates, 1.8% phosphates, and trace silica. Igneously zoned pyroxenes are often ~2 mm in size. Pyroxene zoning shows pigeonitic cores and augitic rims, suggesting an early crystallizing, evolving liquidus phase composition. Phenocrystic pyroxene grains often form cumulate masses up to 10mm in size. Phenocrystic olivines are typically less than 1mm and are unzoned. Maskelynlite laths are typically 0.1 × 1 mm in size and often, along with fine-grained pigeonite and olivine, occupy interstitial, later crystallizing zones. Ubiquitous oxides include ilmenite, titano-magnetite, and chromite. Rare silicate melt pockets ~200 μm with concentrated Fe-sulfide blebs were observed. Calcite, presumably from desert weathering, was observed in fractures. Minor amounts of barite were also detected. Secondary alteration patches within pyroxene and olivine were observed in some grains. Some grains of plagioclase had K-rich secondary alteration. It is unknown if these alteration products are of terrestrial or martian origin.

Geochemistry: (C. Agee, UNM) Olivine Fa45.2±2.2, Fe/Mn=49±4, CaO=0.15±0.04 (wt%), n=4; pyroxene Fs26.7±4.4Wo14.0±11.6, Fe/Mn=30±3, n=39; maskelynite An48.4±5.0Ab48.9±4.0Or2.8±1.2, n=10.

Classification: Martian shergottite (olivine-pigeonite phyric basalt).

Specimens: 20.11 g on deposit at UNM, Jay Piatek holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):1720
Class:Martian (shergottite)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):45.2±2.2
Ferrosilite (mol%):26.7±4.4
Wollastonite (mol%):14.0±11.6
Classifier:C. Agee, UNM
Type spec mass (g):20.11
Type spec location:UNM
Main mass:Jay Piatek
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)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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