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Northwest Africa 2739 | |||||||||||||||||
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Basic information | Name: Northwest Africa 2739 This is an OFFICIAL meteorite name. Abbreviation: NWA 2739 Observed fall: No Year found: 2002 Country: Algeria Mass: ![]() | ||||||||||||||||
Classification history: |
This is 1 of 453 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||
Writeup![]() |
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: |
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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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 89, MAPS 40, A201-A263 (2005)
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Geography:![]() |
Statistics: This is 1 of 1315 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters) |