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Northwest Africa 12203
Basic information Name: Northwest Africa 12203
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12203
Observed fall: No
Year found: 2018
Country: Algeria
Mass:help 293 g
Classification
  history:
Recommended:  Howardite    [explanation]

This is 1 of 359 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 9 Nov 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12203 (NWA 12203)

Algeria

Purchased: May 2018

Classification: HED achondrite (Howardite)

History: Found near Oum El Assel, Algeria, March 2018. Purchased by Darryl Pitt in Mauritania, May 2018.

Physical characteristics: Single stone, with weathered exterior. A saw cut reveals a very dark gray surface with faint appearing clasts and mineral fragments.

Petrography: (C. Agee) Microprobe examination of a polished mount shows a fragmental breccia of pyroxene, plagioclase, and lithic clasts. The meteorite consists of approximately 50% diogenite and 50% eucrite.

Geochemistry: (C. Agee, UNM) Diogenite pyroxene Fs28.1±2.5Wo2.6±1.0, Fe/Mn=29±2, n=7; eucrite pigeonite Fs47.5±5.9Wo6.7±3.1, Fe/Mn=30±2, n=6, eucrite high-Ca pyroxene Fs29.3±2.6Wo39.1±1.9, Fe/Mn=30±2, n=2, plagioclase An88.7±5.6, n=5.

Classification: Howardite

Specimens: 23.3 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):293
Pieces:1
Class:Howardite
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):28.1±2.5, 47.5±5.9, 29.3±2.6
Wollastonite (mol%):2.6±1.0, 6.7±3.1, 39.1±1.9
Classifier:C. Agee, UNM
Type spec mass (g):23.3
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Field name MVCH-364; 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, in preparation (2018)
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 938 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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