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Northwest Africa 13458
Basic information Name: Northwest Africa 13458
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13458
Observed fall: No
Year found: 2008
Country: Morocco
Mass:help 6.5 kg
Classification
  history:
Recommended:  H5    [explanation]

This is 1 of 10909 approved meteorites (plus 20 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 10 Oct 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13458 (NWA 13458)

Dakhla, Morocco

Purchased: March 2008

Classification: Ordinary chondrite (H5)

History: The meteorite was purchased by Svend Buhl from Moroccan meteorite dealer Abdellah Afiniss in March 2008 in Agadir, Morocco. Takafumi Niihara purchased whole rock from Svend Buhl in March 2020.

Physical characteristics: Total mass is 6.5 kg. 1 single stone. 80-90% of the meteorite is covered with fusion crust.

Petrography: (T. Mikouchi and T. Niihara, UTok; H. Ono, Chiba) Chondrule size is 0.5-1.0 mm. Plagioclase is 10-50 μm.

Geochemistry: Mineral compositions: Electron microprobe analysis shows that olivine is Fa17.5-18.6 (N=33) and orthopyroxene is Fs15.4-16.4Wo1.0-3.5 (N=4).

Classification: H5

Specimens: A 24 g type specimen is on deposit at UTok.

Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:Dakhla
Place of purchase:Agadir, Morocco
Date:P March 2008
Mass (g):6500
Pieces:1
Class:H5
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):18.1±0.5 (N=33)
Ferrosilite (mol%):14.4±1.0 (N=4)
Wollastonite (mol%):1.7 (1.0-3.5, N=4)
Classifier:T. Mikouchi and T. Niihara, UTok; H. Ono, Chiba
Type spec mass (g):24
Type spec location:UTok
Main mass:T. Niihara (UTok)
Finder:Abdellah Afiniss
Comments:Submitted by T. Mikouchi (UTok)
Institutions
   and collections
UTok: University Museum, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan (institutional address; updated 3 Oct 2021)
Chiba: Chiba Institute of Technology, Tsudanuma, Narashino, Chiba 275-0016, Japan (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is the only approved meteorite from Dakhla, Morocco
     This is 1 of 1887 approved meteorites from Morocco (plus 26 unapproved names) (plus 1 impact crater)

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