Meteoritical Bulletin: Entry for Northwest Africa 16322

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Northwest Africa 16322

Basic information

Name: Northwest Africa 16322
This is an OFFICIAL meteorite name.
Abbreviation: NWA 16322
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass: 33 g

Classification
history:

Recommended:

Martian (shergottite) [explanation]

This is 1 of 307 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all]
Search for other: Martian meteorites

Comments:

Approved 10 Nov 2023

Writeup

help

Writeup from MB 112:

Northwest Africa 16322 (NWA 16322)

(Northwest Africa)

Purchased: 2023 Sept

Classification: Martian meteorite (Shergottite)

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

Physical characteristics: Grayish rock partly covered with fusion crust.

Petrography: The meteorite is composed of up to 2 mm sized elongated pyroxenes, up to 1.5 mm sized partly euhedral olivine crystals, and interstital up to to 800 µm lath-shaped maskelynite grains. Pyroxenes display patchy compositional zoning; olivines mostly show magmatic zoning with Mg-rich cores and Fe-rich rims and contain abundant magmatic inclusions. Minor phases include chromite, ilmenite, troilite, and FeNiS. Contains abundant glassy to finely recrystallized shock melt veins and pocket.

Geochemistry: olivine: Fa_40.5±9.4 (Fa_28.5-56.1, FeO/MnO=48±2, n=10); pyroxene: Fs_29.7±8.1Wo_10.0±6.7? (Fs_24.5-45.7Wo_4.4-26.8, FeO/MnO=28±2, n=10); maskelynite (An_49.0-54.4Ab_43.2-47.7Or_2.3-3.1, n=10)

Classification: Martian (shergottite), olivine-bearing

Data from:
  MB112
  Table 0
  Line 0:

Place of purchase:	Temara, Morocco
Date:	P 2023 Sept
Mass (g):	33
Pieces:	1
Class:	Martian (shergottite)
Shock stage:	high
Weathering grade:	low
Fayalite (mol%):	40.5
Ferrosilite (mol%):	29.7
Wollastonite (mol%):	10.0
Classifier:	A. Greshake, MNB
Type spec mass (g):	6.7
Type spec location:	MNB
Main mass:	Said Yousfi
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. 112, in preparation (2023)

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Photos:

Credit	Photos
Public domain photographs:
Ansgar Greshake

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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