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Northwest Africa 13884
Basic information Name: Northwest Africa 13884
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13884
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 4.11 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 6 May 2021
Writeup from MB 110:

Northwest Africa 13884 (NWA 13884)

(Northwest Africa)

Purchased: 2020

Classification: Martian meteorite (Shergottite)

History: Purchased in 2020 by Daniel Sheikh from a meteorite dealer in Morocco.

Physical characteristics: Single stone with minor fusion crust.

Petrography: (D. Sheikh, FSU) Specimen displays a porphyritic texture containing euhedral to subhedral olivine megacrysts (Av. 1.5 mm, up to 2.5 mm) set within a finer-grained groundmass containing pigeonite, augite, plagioclase, maskelynite, pyrrhotite, Cr-ulvöspinel, merrillite, ilmenite, and Si-Al-rich glass. Most plagioclase grains/laths show transformation into maskelynite occurring primarily in the cores, while the rims remain largely unaffected.

Geochemistry: Olivine (Fa45.8±3.2, range Fa37.7-49.7, FeO/MnO=51±7, n=47), Pigeonite (Fs34.7±2.3Wo11.8±1.8, range Fs29.5-37.7Wo9.2-15.3, FeO/MnO=31±4, n=20), Augite (Fs21.6±1.8Wo33.5±2.5, range Fs19.3-23.4Wo31.1-37.2, FeO/MnO=27±4, n=6), Plagioclase (An59.3±7.6, range An39.6-67.6, n=22).

Classification: Martian (olivine-phyric shergottite) based on the texture, overall mineral content and compositions.

Specimens: 1.03 gram at App; main mass with D. Sheikh.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):4.11
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):45.8±3.2
Ferrosilite (mol%):34.7±2.3, 21.6±1.8
Wollastonite (mol%):11.8±1.8, 33.5±2.5
Classifier:D. Sheikh, FSU
Type spec mass (g):1.03
Type spec location:App
Main mass:D. Sheikh
Comments:Submitted by Daniel Sheikh
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
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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