Meteoritical Bulletin: Entry for Northwest Africa 12932

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Northwest Africa 12932

Basic information

Name: Northwest Africa 12932
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12932
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass: 2.91 kg

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Eucrite-unbr
Recommended:			Eucrite-unbr [explanation]

This is 1 of 136 approved meteorites classified as Eucrite-unbr. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 21 Nov 2019

Writeup

help

Writeup from MB 108:

Northwest Africa 12932 (NWA 12932)

(Northwest Africa)

Purchased: 2016

Classification: HED achondrite (Eucrite, unbrecciated)

History: Purchased Nov 2016 by Dustin Dickens in Mauritania from anonymous dealer.

Physical characteristics: Single stone, fusion-crusted exterior, broken surface and saw cut reveals a light colored, fine-grained mix of plagioclase and pyroxene grains.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows an ophitic texture with approximately 60% pyroxene and 35% plagioclase. Many pyroxenes have exsolution lamellae. Minor silica and troilite observed.

Geochemistry: (C. Agee, UNM) Low-Ca pyroxene Fs_61.9±0.6Wo_2.8±1.1, Fe/Mn=31±1, n=8; high-Ca pyroxene Fs_28.2±2.1Wo_43.2±2.3, Fe/Mn=31±1, n=4; plagioclase An_86.7±4.1, n=6.

Classification: Basaltic eucrite, equilibrated, unbrecciated.

Specimens: 20.6 g including a probe mount on deposit at UNM, Dustin Dickens holds the main mass.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Mauritania
Date:	P 2016
Mass (g):	2912
Pieces:	1
Class:	Eucrite-unbr
Shock stage:	moderate
Weathering grade:	low
Ferrosilite (mol%):	61.9±0.6, 28.2±2.1
Wollastonite (mol%):	2.8±1.1, 43.2±2.3
Classifier:	C. Agee, UNM
Type spec mass (g):	20.6
Type spec location:	UNM
Main mass:	Dustin Dickens
Comments:	Field name DD-57; 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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Geography:

Coordinates:

Unknown.

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

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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