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Northwest Africa 4026
Basic information Name: Northwest Africa 4026
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4026
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 266 g
Meteoritical Bulletin:  MB 91  (2007)  CK4/5
Recommended:  CK4/5    [explanation]

This is 1 of 15 approved meteorites classified as CK4/5.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 28 Mar 2007
Writeup from MB 91:

Northwest Africa 4026

Northwest Africa

Find: August 2005

Carbonaceous chondrite (CK4/5)

History: The meteorite was found by an anonymous finder in the western part of the Sahara and bought by the main mass holder in Erfoud, Morocco.

Physical characteristics: Two stones weighing a total of 265.6 g were recovered.

Petrography: (A. Greshake, MNB) The meteorite contains large 500–1200 µm size and mostly well-discernable chondrules that are embedded into a fine-grained partly recrystallized matrix. The silicates are completely equilibrated and feldspar is present in the matrix. The meteorite contains Cr-rich magnetite and minor augite.

Mineral compositions and geochemistry: Olivine (Fa30.1), low-Ca pyroxene (Fs25.7), determined by EMP. Oxygen isotopes: (I. A. Franchi and R. C. Greenwood, OU) δ17O = −4.29, δ18O = −0.14, Δ17O = −4.22 (mean of 2, all ‰).

Classification: Carbonaceous chondrite (CK4/5); minimal shock, moderate weathering.

Type specimen: A total of 22.5 g plus one polished thin section are on deposit at MNB. HSSH holds the main mass.

Data from:
  Table 2
  Line 168:
Place of purchase:Erfoud, Morocco
Date:2005 Aug
Mass (g):265.6
Shock stage:minimal
Weathering grade:moderate
Fayalite (mol%):30.1
Ferrosilite (mol%):25.7
Classifier:A. Greshake, MNB
Type spec mass (g):8
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   

     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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