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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 293 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 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 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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