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Northwest Africa 12694
Basic information Name: Northwest Africa 12694
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12694
Observed fall: No
Year found: 2018
Country: Algeria
Mass:help 253 g
Classification
  history:
Recommended:  Howardite    [explanation]

This is 1 of 368 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 4 Jul 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12694 (NWA 12694)

Algeria

Purchased: 2018

Classification: HED achondrite (Howardite)

History: Reportedly found in 2018 by nomads in Algeria. Purchased in Ensisheim from a Moroccan meteorite dealer, 2018.

Physical characteristics: Single stone covered with fusion crust, some of which is slightly weathered, while some patches show shiny black glass with contraction cracks and flight-smooth edges; possibly oriented. The cut surface reveals a fragmental breccia of light and dark clasts set in a light-gray groundmass.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a polymict breccia of basaltic eucrite grains (~60%) and diogenite grains (~40%). Most eucritic pyroxenes display exsolution lamellae and are typically finer-grained than the diogenitic pyroxene grains. Accessory olivine, chromite, silica, and troilite was observed.

Geochemistry: (C. Agee, UNM) Olivine Fa50.7±4.3, Fe/Mn=45±2, n=2; eucritic pyroxene Fs49.1±11.3Wo13.7±12.7, Fe/Mn=31±2 n=12; diogenitic pyroxene Fs24.6±3.2Wo2.4±0.8, Fe/Mn=28±2 n=8; plagioclase An90.6±5.5, n=8.

Classification: Howardite

Specimens: 20 g on deposit at CSFK, probe mount at UNM, ZKereszty holds the main mass.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Ensisheim
Date:P 2018
Mass (g):253.2
Pieces:1
Class:Howardite
Shock stage:high
Weathering grade:low
Fayalite (mol%):50.7±4.3
Ferrosilite (mol%):49.1±11.3, 24.6±3.2
Wollastonite (mol%):13.7±12.7, 2.4±0.8
Classifier:C. Agee, UNM
Type spec mass (g):20
Type spec location:CSFK
Main mass:ZKereszty
Comments:Field name ZK-14; 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)
ZKereszty: Gyor, Lahner 1. 9024 , Hungary (private address; updated 8 Sep 2014)
CSFK: Research Center for Astronomy and Earth Sciences, H-1121 Budapest, Konkoly Thege Miklós út 15-17.l Hungary, Hungary (institutional address; updated 7 Apr 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 964 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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