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Northwest Africa 4025
Basic information Name: Northwest Africa 4025
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4025
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 746 g
Meteoritical Bulletin:  MB 91  (2007)  CB
Recommended:  CB    [explanation]

This is 1 of 8 approved meteorites classified as CB.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CB chondrites, CH-CB family, and Metal-rich meteorites
Comments: Approved 28 Mar 2007
Writeup from MB 91:

Northwest Africa 4025


Find: August 2005

Carbonaceous chondrite (CB)

History: A total of 69 fragments were purchased in August 2005 from a dealer in Erfoud, Morocco.

Physical characteristics: The small, mostly angular fragments, totaling 745.5 g, display a rusty brown surface; fusion crust is almost absent.

Petrography: (A. Greshake, MNB) The meteorite is characterized by a high modal metal abundance of about 60–80 vol%. The silicate portion contains abundant, large (up to several millimeters) and clearly defined chondrules of different textural types including cryptocrystalline, BO, PO, and POP chondrules.

Mineral compositions and geochemistry: Olivine (Fa1.7–4.4), low-Ca pyroxene (Fs1.5–3.9), determined by EMP. Oxygen isotopes: (I. A. Franchi and R. C. Greenwood, OU) δ17O = 0.22, δ18O = 3.73, Δ17O = −1.72 (mean of 2, all ‰). Nitrogen isotopes: (I. A. Franchi and A. Verchovsky, OU) 89.8 ppm N with a bulk δ15N = 601 ‰ and a peak at 1000 °C of 1169‰.

Classification: Carbonaceous chondrite (CB); S3, moderate weathering. The meteorite is a Bencubbin-like carbonaceous chondrite (CB) based on petrography and metal/silicate ratio while O-isotopes suggest a close relation to CH chondrites.

Type specimen: A total of 20 g plus one polished thin section are at MNB. HSSH holds the main mass.

Data from:
  Table 2
  Line 167:
Place of purchase:Erfoud, Morocco
Date:2005 Aug
Mass (g):745.5
Shock stage:S3
Weathering grade:moderate
Fayalite (mol%):1.7-4.4
Ferrosilite (mol%):1.5-3.9
Classifier:A. Greshake, MNB
Type spec mass (g):20
Type spec location:MNB
Main mass:HSSH
Plots: O isotopes:  
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
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)
HSSH: Hanno Strufe, Langenbergstr. 32, 66954 Pirmasens, Germany; Website (private address)
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
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Photos from the Encyclopedia of Meteorites:
Hanno Strufe      
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
bphd Photo added 20 Oct 2022
Dirk Hohmann Photo added 20 Oct 2022
Photo added 20 Oct 2022
eraserhead Photo added 20 Oct 2022
Jay Buscio   
Jay Piatek   
Matteo Chinellato   
Volker Heinrich Photo added 20 Oct 2022

     This is 1 of 8744 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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