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Northwest Africa 13229
Basic information Name: Northwest Africa 13229
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13229
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 107 g
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 213 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 10 Mar 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13229 (NWA 13229)

(Northwest Africa)

Purchased: 2019

Classification: Martian meteorite (Shergottite)

History: The meteorite was purchased from a meteorite dealer in Laayoune, Morocco.

Physical characteristics: Grayish to light brownish fragment without fusion crust.

Petrography: Medium-grained basalt composed of up to 1 mm sized calcic pyroxenes that show complex irregular patchy compositional zoning and equally sized maskelynite grains. Minor phases include ilmenite, merrillite, FeS, and some Si-rich mesostasis. Pyroxene displays very fine exsolution lamellae. The meteorite is highly shocked and contains abundant shock melt pockets up to 1 mm in diameter. Cracks are often filled with terrestrial carbonates.

Geochemistry: pigeonite: Fs56.4±7.0Wo15.8±1.2 (Fs47.2-65.0Wo14.4-17.7, n=8, FeO/MnO=30-33); augite: Fs27.4±8.4Wo34.7±2.5 (Fs18.2-38.2Wo29.1-38.6, n=12, FeO/MnO=22-33); maskelynite: An58.1±1.0Ab41.9±1.0, n=14

Classification: Martian (shergottite)

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Laayoune, Morocco
Date:P 2019
Mass (g):107
Pieces:1
Class:Martian (shergottite)
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):56.4; 27.4
Wollastonite (mol%):15.8; 34.7
Classifier:A. Greshake, MNB
Type spec mass (g):20.1
Type spec location:MNB
Main mass:Larbi Chnaoui
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7228 approved meteorites from (Northwest Africa) (plus 1998 unapproved names)

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