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Northwest Africa 2644 | |||||||||||||||||
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Basic information | Name: Northwest Africa 2644 This is an OFFICIAL meteorite name. Abbreviation: NWA 2644 Observed fall: No Year found: 2004 Country: (Northwest Africa) Mass: 216 g | ||||||||||||||||
Classification history: |
This is 1 of 451 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||
Writeup |
Writeup from MB 89:
Northwest Africa 2644 Northwest Africa Purchased 2004 Achondrite (howardite) A 216 g dark, crusted stone was purchased in Erfoud, Morocco in August 2004. Description and classification (T. Bunch and J. Wittke, NAU): composed of typical cumulate and basaltic eucrite clasts and large (up to 2.8 mm diameter), very dark shock-melt and breccia clasts of glass, quench crystals, and shocked diogenite and eucrite fragments, all set in a very light-colored and fine-grained matrix. In addition, irregular to sub-rounded metal grains up to 3 mm in diameter are present within the shocked clasts and randomly distributed in the matrix. Diogenite orthopyroxene, Fs21.3-29Wo0.8-3.1 (FeO/MnO = 24.5-32.4); shocked clast pigeonite, Fs29.1-31.8Wo3.4-6.1 (FeO/MnO = 30.2=33.4); cumulate pyroxene, Fs51.4-56.4Wo2.9-3.8; large plagioclase fragments, An90-94.2; metal, Ni = 4.4–18.3 wt. %. Low-grade weathering and low level shock; shock-melt/breccia clasts experienced high shock levels. Specimens: 22.0 g type sample, NAU; main mass, Oakes. | ||||||||||||||||
Data from: MB89 Table 7 Line 351: |
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Institutions and collections |
NAU: Geology, Bldg 12
Knoles Dr
Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012) Oakes: Nelson Oakes, Route 1, House 50C, Uniondale, PA 18470, United States; Website (private address) |
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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 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names) | ||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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