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Northwest Africa 13400
Basic information Name: Northwest Africa 13400
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13400
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 605 g
Recommended:  C3-ung    [explanation]

This is 1 of 20 approved meteorites classified as C3-ung.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), and Ungrouped chondrites
Comments: Approved 5 Sep 2020
Writeup from MB 109:

Northwest Africa 13400 (NWA 13400)

(Northwest Africa)

Purchased: 2016 Dec

Classification: Carbonaceous chondrite (C3, ungrouped)

Petrography: (K. Metzler, IfP) Carbonaceous chondrite, consisting of closely packed, metal-bearing chondrules (apparent size up to 2.8 mm), chondrule fragments, and CAIs (apparent size up to 3.8 mm) with low amounts of interchondrule matrix (17 vol%). The mean apparent chondrule size is 480 µm (n=512).

Geochemistry: Mineral compositions and geochemistry: The mean olivine composition is Fa14.7±1.3 (Fa10.2-16.0, n=30); the mean low-Ca pyroxene composition is Fs6.6±3.7Wo1.0±0.1 (Fs1.2-15.9Wo0.8-1.2, n=20). Oxygen isotopic composition (R. Greenwood, OU): δ17O=-4.017‰, δ18O=-0.021‰, Δ17O=-4.006‰.

Classification: Carbonaceous chondrite (ungrouped). Petrologic type 3.9 based on the percentage mean deviation (PMD) of Fa values (8.8%). Classified as ungrouped due to the low mean Fa and Fs values of olivine and low amount of matrix compared to e.g., CV chondrites. Chondrule size does not fit with either CV, CK or CK chondrites that are the closest groups in terms of oxygen isotopic composition.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2016 Dec
Mass (g):605
Shock stage:S2
Weathering grade:W2/3
Fayalite (mol%):14.7±1.3 (n=30)
Ferrosilite (mol%):6.6±3.7 (n=20)
Wollastonite (mol%):1.0±0.1
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Mirko Graul, Bernau, Germany
Comments:Submitted by K. Metzler, IfP
Plots: O isotopes:  
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Denis gourgues   
Public domain photographs:
Knut Metzler   

     This is 1 of 7752 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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