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Northwest Africa 13289
Basic information Name: Northwest Africa 13289
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13289
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 387 g
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 221 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 2 May 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13289 (NWA 13289)

(Northwest Africa)

Purchased: 2019

Classification: Martian meteorite (Shergottite)

History: Marc Jost (SJS) purchased the 387.4g sample from Aziz Mouadine in Rissani, Morocco, in July, 2019.

Physical characteristics: Sample is irregular in shape and has a dark-brown, wind ablated surface. One portion of the stone contains a coating of orange caliche. The cut face shows an igneous texture composed of light greenish-gray colored interlocking crystals.

Petrography: Description and Classification (A. Love, App) Sample has an diabasic texture composed of 62 vol% chaotically-zoned, prismatic pyroxenes (568 μm avg. length), 34 vol% lath-shaped maskelynite (781 μm in length), Fe-Ti oxides with ilmenite lamellae, 2 vol% merrillite, mesostasis, pyrrhotite. Some pyroxenes show ~1um exsolution lamellae. Maskelynite is zoned with K-bearing rims (An45Or4) and more calcic cores (An49Or2).

Geochemistry: (A.Love, App) Pyroxenes show two compositional trends: pigeonite (Fs35.7-59.1Wo9.9-20.8, average Fs48.2±7.9Wo15.2±3.6, Fe/Mn=35.2±2.6, n=21) and augite (Fs20.0-46.7Wo36.5-28.5, average Fs48.2±6.8Wo32.3±2.0, Fe/Mn=30.3±3.0, n=26). Ferropigeonite (Fs67.7±2.9Wo17.1±0.1, Fe/Mn=36.8±1.8, n=2). Maskelynite (An47.5±5.2Or2.7±1.7, n=18).

Classification: Martian (basaltic shergottite). Based on chaotic patchy zonation, distinctive compositions and Fe/Mn ratios of pyroxenes and compositions of maskelynite, this sample is a martian meteorite. Mineralogy and textures suggest this is a basaltic shergottite, M-S4 (Stöffler et al., 2018) low weathering grade.

Specimens: Marc Jost (SJS) holds the main mass. A polished thin section, an endcut, a slice and few fragments weighing 21.87 g are on deposit at App.

Bibliography:
  • Stöffler D., Hamann C., and Metzler K. (2018) Shock metamorphism of planetary silicate rocks and sediments: Proposal for an updated classification system. Meteorit. Planet. Sci. 53, 5-49. (link)
Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Rissani
Date:P 2019
Mass (g):387.4
Pieces:1
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):48.2±7.9; 48.2±6.8
Wollastonite (mol%):15.2±3.6; 32.3±2.0
Magnetic suscept.:3.15
Classifier:A. Love, App
Type spec mass (g):21.87
Type spec location:App
Main mass:Marc Jost (SJS)
Finder:Unknown
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7269 approved meteorites from (Northwest Africa) (plus 1987 unapproved names)

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