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Northwest Africa 12189
Basic information Name: Northwest Africa 12189
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12189
Observed fall: No
Year found: 2018
Country: Algeria
Mass:help 435 g
Classification
  history:
Recommended:  Ureilite    [explanation]

This is 1 of 475 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 9 Nov 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12189 (NWA 12189)

Algeria

Purchased: May 2018

Classification: Ureilite

History: Found near Tindouf, February 2018. Purchased by Darryl Pitt in Mauritania, May 2018.

Physical characteristics: Single stone; irregular, sandblasted exterior; saw cut reveals an interior mosaic of light and dark gray-brown crystals.

Petrography: (C. Agee, UNM) This meteorite consists of olivine, pigeonite, graphite and Fe-metal. Ubiquitous, finely disseminated Fe-metal is occupies zones between silicate grain boundaries. Elongate graphite grains up to 1 mm are present throughout. Significant oxidation reduction rims observed on olivine grains with compositions of ~Fa08.

Geochemistry: (C. Agee, UNM) Olivine Fa21.5±0.1, Fe/Mn=47±4, Cr2O3=0.54±0.10 (wt%), n=5; pigeonite Fs17.8±0.1Wo4.8±0.8, Fe/Mn=30±1, n=6.

Classification: Ureilite, graphite-bearing.

Specimens: 21.1 g including a probe mount 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):435
Pieces:1
Class:Ureilite
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):21.5±0.1
Ferrosilite (mol%):17.8±0.1
Wollastonite (mol%):4.8±0.8
Classifier:C. Agee, UNM
Type spec mass (g):21.1
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Field name MVCH-350; 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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