Meteoritical Bulletin: Entry for Northwest Africa 13229

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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: 107 g

Classification
history:

Meteoritical Bulletin:	MB 109	(2020)	Martian (shergottite)
Recommended:			Martian (shergottite) [explanation]

This is 1 of 321 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all]
Search for other: Martian meteorites

Comments:

Approved 10 Mar 2020

Writeup

help

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: Fs_56.4±7.0Wo_15.8±1.2(Fs_47.2-65.0Wo_14.4-17.7, n=8, FeO/MnO=30-33); augite: Fs_27.4±8.4Wo_34.7±2.5(Fs_18.2-38.2Wo_29.1-38.6, n=12, FeO/MnO=22-33); maskelynite: An_58.1±1.0Ab_41.9±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:

Credit	Photos
Public domain photographs:
Ansgar Greshake

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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