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Northwest Africa 12261
Basic information Name: Northwest Africa 12261
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12261
Observed fall: No
Year found: 2018
Country: Algeria
Mass:help 21.6 kg
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  H3
Recommended:  H3    [explanation]

This is 1 of 632 approved meteorites (plus 2 unapproved names) classified as H3.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 27 Mar 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12261 (NWA 12261)

Algeria

Purchased: 2018 Aug

Classification: Ordinary chondrite (H3)

History: Found near Ain Saleh, Algeria, and purchased by Ben Hoefnagels in August 2018 from a Moroccan dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Closely packed, relatively small, well-formed chondrules (420±280 µm, N = 20) are set in finer grained matrix containing merrillite and abundant metal. A large (1.6 cm across) equilibrated H5 clast is present in the studied thin section.

Geochemistry: Olivine (Fa0.9-23.5, Cr2O3 in ferroan examples 0.02-0.04 wt.%, mean 0.03±0.01 wt.%, N = 8), orthopyroxene (Fs3.8-16.7Wo0.4-1.2, N = 3), subcalcic augite (Fs10.0Wo27.6). Magnetic susceptibility log χ (× 10-9 m3/kg) = 5.43.

Classification: Ordinary chondrite (H3).

Specimens: 25.5 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2018 Aug
Mass (g):21600
Pieces:many
Class:H3
Shock stage:S2
Weathering grade:W1/2
Fayalite (mol%):16.4±7.2 (n=8)
Ferrosilite (mol%):9.5±6.6 (n=3)
Wollastonite (mol%):0.7±0.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):25.5
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH161; submitted by A. Irving
Institutions
   and collections		 UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1088 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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