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Northwest Africa 2340
Basic information Name: Northwest Africa 2340
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2340
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass:help 4.6 g
Classification
  history:
Meteoritical Bulletin:  MB 91  (2007)  CR2
Recommended:  CR2    [explanation]

This is 1 of 188 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Comments: Approved 28 Mar 2007
Writeuphelp
Writeup from MB 91:

Northwest Africa 2340

Northwest Africa

Find: May 2004

Carbonaceous chondrite (CR2)

History and physical characteristics: H. Grundmann purchased a 4.6 g fragment from a Moroccan dealer in Zagora, Morocco, in May 2004. Magnetic susceptibility: (Bart) log χ = 4.91 × 10−9 m3/kg.

Petrography: (R. Bartoschewitz, Bart) Well-defined metal-bearing chondrules from 0.5 to 2 mm, chondrule fragments, and metal grains up to 1 mm are embedded in a fine-grained dark matrix. The chondrule/matrix ratio is about 3:1.

Mineral compositions and geochemistry: Oxygen isotopes: (M. Kusakabe, OkaU) δ17O =1.77, δ18O =5.37 (both ‰).

Type specimen: A total of 0.9 g is on deposit at Vern. Bart holds 0.9 g and Grund holds the main mass.

Data from:
  MB91
  Table 2
  Line 93:
Place of purchase:Zagora, Morocco
Date:2004
Mass (g):4.6
Pieces:1
Class:CR2
Weathering grade:W1
Magnetic suscept.:4.91
Classifier:R. Bartoschewitz, Bart
Type spec mass (g):0.9
Type spec location:Vernad
Main mass:H. Grundmann
Plots: O isotopes:  
Institutions
   and collections		 Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
Bart: Bartoschewitz Meteorite Laboratory, Weiland 37, D-38518 Gifhorn, Germany; Website (private address; updated 30 Nov 2019)
Grund: H. Grundmann, Berlin, Germany (private address)
Grundmann: H. Grundmann, Berlin, Germany (private address)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
Vern: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
Catalogs:
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9370 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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