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| Northwest Africa 4470 | |||||||||||||
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| Basic information | Name: Northwest Africa 4470 This is an OFFICIAL meteorite name. Abbreviation: NWA 4470 Observed fall: No Year found: 2006 Country: Algeria Mass:  631 g | ||||||||||||
| Classification history: |
This is 1 of 16 approved meteorites classified as Eucrite-an. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||
| Comments: | Approved 24 Jul 2007 | ||||||||||||
| Writeup |
Writeup from MB 92:
Northwest Africa 4470 Algeria Find: July 2006 Achondrite (eucrite, basaltic, anomalous) History: G. Hupé purchased the specimen in July 2006 in Rissani, Morocco. Physical characteristics: The sample is made up of a total of 48 broken gray stones with a combined weight of 631 g. Petrography: (A. Irving and S. Kuehner, UWS) The meteorite is composed mainly of large, distinctively zoned low-Ca pyroxene grains (≤ 0.8 mm) and interstitial plagioclase, with minor silica (associated with blebby troilite), augite, chromite and ilmenite. No metal was observed.Many pigeonite grains consist of multiple subgrains, with narrow zones of ferroan olivine along their boundaries. Mineral compositions and geochemistry: Orthopyroxene cores (Fs31.3-33.9Wo4.6-5.2, FeO/MnO = 26.8-27.4) have sharply defined boundaries against wider, much more Fe-rich mantles of exsolved pigeonite (host orthopyroxene Fs59.1-60.3Wo2.9-3.9, FeO/MnO = 31.9-33.9); olivine along subgrain boundaries in pyroxene (Fa81.7, FeO/MnO = 42.3); plagioclase (An88.9Or0.3). Classification: Achondrite (eucrite, basaltic, anomalous). The ferron olivine along grain boundaries and the gap in pyroxene compositions requires that this sample be classified as anomalous. Type specimens: A total of 20.1 g of sample and one polished thin section are on deposit at UWS. GHupé holds the main mass. | ||||||||||||
| Data from: MB92 Table 2 Line 73: |
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| Institutions and collections |
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) GHupé: Gregory M. Hupé, 9003 Placid Lakes Blvd., Lake Placid, FL 33852, United States; Website (private address) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
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Geography:
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Statistics: This is 1 of 1402 approved meteorites from Algeria (plus 33 unapproved names) (plus 4 impact craters) | ||||||||||||