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Northwest Africa 2739
Basic information Name: Northwest Africa 2739
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2739
Observed fall: No
Year found: 2002
Country: Algeria
Mass:help 824 g
Classification
  history:
Meteoritical Bulletin:  MB 89  (2005)  Howardite
MetBase:  v. 7.1  (2006)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 439 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Writeuphelp
Writeup from MB 89:

Northwest Africa 2739

Algeria

Found 2002-2003

Achondrite (howardite)

Four stones weighing 824 g in total covered with fresh fusion crust were found in winter 2002/2003 by an anonymous finder in Western Sahara. Classification and mineralogy (V.Moggi-Cecchi; G.Pratesi): polymict breccia mainly with cumulate eucrite fragments; diogenite fragments not exceed 10% of the total surface. Orthopyroxene crystals, commonly set into a clastic matrix, are the main silicate phase. Their compositions vary from more Fe-rich terms (Fs24.43En73.90Wo1.67) to more Mg-rich terms (Fs12.18En87.66Wo0.16). Other types of fragments include large plagioclase (An92.52Ab7.00Or0.48) and augite; minor phases are sulfides and Fe-Ni metal; a chromite grain with  Cr/(Cr+Al) = 0.88 and Fe:Mn:Mg ratios = 0.85:0.02:0.13) is also present. Oxygen isotope measurements (δ17O = +1.554‰;  δ18O = +3.439‰; Δ17O = -0.234‰ - I.Franchi, R.Greenwood, Open University) plot on the HED area, with a slightly more negative value. Shock degree is low as well as degree of weathering. Specimens: Main mass with anonymous finder; type specimen 35 g plus one polished thin section MSP.

Data from:
  MB89
  Table 7
  Line 363:
Origin or pseudonym:Algeria
Date:2002/2003
Mass (g):824
Pieces:4
Class:How
Classifier:G. Pratesi and V. Moggi Cecchi, MSP
Type spec mass (g):35
Comments:Classifier corrected in MB92
Plots: O isotopes:  
Institutions
   and collections		 MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 22 Oct 2022)
Catalogs:
References: Published in Meteoritical Bulletin, no. 89, MAPS 40, A201-A263 (2005)
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1277 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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