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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)
Jay Buscio   
Jay Piatek   
Matteo Chinellato   

     This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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