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Northwest Africa 12822
Basic information Name: Northwest Africa 12822
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12822
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 172 g
Meteoritical Bulletin:  MB 108  (2020)  Angrite
Recommended:  Angrite    [explanation]

This is 1 of 38 approved meteorites classified as Angrite.   [show all]
Search for other: Achondrites, Angrites
Comments: Approved 18 Aug 2019
Writeup from MB 108:

Northwest Africa 12822 (NWA 12822)

Northwest Africa

Purchased: 2019

Classification: Angrite

History: Purchased by Habib Naji from a Moroccan meteorite hunter in Morocco, March 2019.

Physical characteristics: Single stone of several fragments that fit together. Irregular shaped exterior, dark brown, lacking fusion crust. Broken surface reveals coarse grains, dark brown and light brown in color, many cleavage faces are visible.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a protogranular texture of calcium-bearing olivine, titanoan aluminian augite, anorthite, and spinel. Approximately half of the kamacite in this meteorite has been altered to iron-oxide. Many fine veinlets of iron-oxide crosscut the primary minerals. Iron sulfide was also detected.

Geochemistry: (C. Agee, UNM) Olivine Fa40.6±0.2, CaO=1.2±0.2 (wt%), Fe/Mn=84±22, n=7; titanoan aluminian augite Fs10.3±1.8Wo53.6±0.6, Al2O3=7.5±0.7, TiO2=1.3±0.1 (both wt%). Fe/Mn=84±2 n=7; anorthtite An99-96, n=3.

Classification: Plutonic angrite, likely paired with NWA 2999 and NWA 3164.

Specimens: 23 g plus a probe mount on deposit at UNM, Habib Naji holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019
Mass (g):172
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):40.6±0.2
Ferrosilite (mol%):10.3±1.8
Wollastonite (mol%):53.6±0.6
Classifier:C. Agee, UNM
Type spec mass (g):23
Type spec location:UNM
Main mass:Habib Naji
Comments:Field name HN826; submitted by C. Agee, UNM
   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)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 8746 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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