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Northwest Africa 12928
Basic information Name: Northwest Africa 12928
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12928
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 1530 g
Classification
  history:
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 228 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 21 Nov 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12928 (NWA 12928)

(Northwest Africa)

Purchased: 2016

Classification: HED achondrite (Eucrite, monomict)

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

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

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

Geochemistry: (C. Agee, UNM) Low-Ca pyroxene Fs53.4±4.6Wo2.5±1.1, Fe/Mn=33±1, n=10; high-Ca pyroxene Fs37.6±17.0Wo28.8±21.7, Fe/Mn=31±2, n=2; plagioclase An80.5±12.3, n=6.

Classification: Monomict basaltic eucrite, equilibrated.

Specimens: 20.9 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):1530
Pieces:1
Class:Eucrite-mmict
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):53.4±4.6, 37.6±17.0
Wollastonite (mol%):2.5±1.1, 28.8±21.7
Classifier:C. Agee, UNM
Type spec mass (g):20.9
Type spec location:UNM
Main mass:Dustin Dickens
Comments:Field name DD-53; 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, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7048 approved meteorites from (Northwest Africa) (plus 1998 unapproved names)

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