Meteoritical Bulletin: Entry for Northwest Africa 12193

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Northwest Africa 12193

Basic information

Name: Northwest Africa 12193
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12193
Observed fall: No
Year found: 2018
Country: Western Sahara
Mass: 241 g

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	Eucrite-pmict
Recommended:			Eucrite-pmict [explanation]

This is 1 of 400 approved meteorites classified as Eucrite-pmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 9 Nov 2018

Writeup

Writeup from MB 107:

Northwest Africa 12193 (NWA 12193)

Western Sahara

Purchased: May 2018

Classification: HED achondrite (Eucrite, polymict)

History: Found in Gdeim Asham, Western Sahara, February 2018. Purchased by Darryl Pitt in Mauritania, May 2018.

Physical characteristics: Single stone, with weathered exterior. A saw cut reveals a fragmental breccia of lithic clasts set in a light colored, fine-grained groundmass.

Petrography: (C. Agee) Microprobe examination of a polished mount shows a mixture of unequilibrated, zoned pyroxenes and equilibrated pyroxenes with exsolution lamellae, leading to the conclusion that there are at least two distinct eucrite lithologies present.

Geochemistry: (C. Agee, UNM) Pyroxene Fs_48.1±14.0Wo_10.7±7.3, Fe/Mn=31±5, n=13; plagioclase An_87.9±4.7, n=4.

Classification: Polymict eucrite

Specimens: 21.9 g including a probe mounts on deposit at UNM, DPitt holds the main mass.

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Mauritania
Date:	P May 2018
Mass (g):	241
Pieces:	1
Class:	Eucrite-pmict
Shock stage:	high
Weathering grade:	moderate
Ferrosilite (mol%):	48.1±14.0
Wollastonite (mol%):	10.7±7.3
Classifier:	C. Agee, UNM
Type spec mass (g):	21.9
Type spec location:	UNM
Main mass:	Darryl Pitt
Comments:	Field name MVCH-354; submitted by C. Agee, UNM

Institutions
and collections

UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462

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Geography:

Western Sahara

Coordinates:

Unknown.

Statistics:
This is 1 of 272 approved meteorites from Western Sahara (plus 20 unapproved names)

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