Meteoritical Bulletin: Entry for Northwest Africa 14673

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Northwest Africa 14673

Basic information

Name: Northwest Africa 14673
This is an OFFICIAL meteorite name.
Abbreviation: NWA 14673
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass: 405 g

Classification
history:

Recommended:

Martian (shergottite) [explanation]

This is 1 of 300 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all]
Search for other: Martian meteorites

Comments:

Approved 19 Feb 2022

Writeup

help

Writeup from MB 111:

Northwest Africa 14673 (NWA 14673)

(Northwest Africa)

Purchased: November 2017

Classification: Martian meteorite (Shergottite)

Physical characteristics: The stone has a granular, sugary texture 60% covered by a fresh fusion crust.

Petrography: R. Hewins, S. Pont, MNHNP. This is a poikilitic shergottite with 50% anhedral olivine (~1 mm ), 26% poikilitic pigeonite (up to 4 mm), 5% chromite (s.l., up to 500 microns), and minor augite. Maskelynite (18%) is generally interstitial though small plagioclase laths were enclosed ophitically by pyroxene. Chromite (up to 400 µm) and Cr-Ti spinel are enclosed by pyroxene and maskelynite. Minor minerals include ilmenite, pyrrhotite and baddelyite. A few shock veins are seen in the hand specimen.

Geochemistry: Mineral compositions and Geochemistry: Olivine is Fo_66.0(SD 0.8) and FeO/MnO 49.9, by coincidence very close to Chassigny olivine in composition. Pigeonite is En₆₃Fs₂₇Wo₁₀and augite En₅₀Fs₁₇Wo_32.Maskelynite is An_59-68.The spinels are chromite with composition Chr82-70,Usp2-4 and Cr-Ti spinel with Chr58-34,Usp30-43.

Classification: Martian (shergottite, poikilitic)

Specimens: Specimen: A single stone of 405 g with poikiliitic texture seen in microscope.

Data from:
  MB111
  Table 0
  Line 0:

Place of purchase:	Agadir
Date:	P November 2017
Mass (g):	405
Pieces:	Single stone
Class:	Martian (shergottite)
Fayalite (mol%):	34
Ferrosilite (mol%):	27; 18
Wollastonite (mol%):	10; 32
Classifier:	R. Hewins, MNHNP
Type spec mass (g):	20
Type spec location:	MNHNP
Main mass:	Luc Labenne
Comments:	Temporary name LM AT; submitted by R. Hewins

Institutions
and collections

MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
USP: Museu de Geociências - USP Rua do Lago, 562 CEP: 05508-080 Butantã - SP Brazil, Brazil; Website (institutional address; updated 22 Oct 2022)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 111, in preparation (2022)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9344 approved meteorites from (Northwest Africa) (plus 1872 unapproved names)

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