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Northwest Africa 4470
Basic information Name: Northwest Africa 4470
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4470
Observed fall: No
Year found: 2006
Country: Algeria
Mass:help 631 g
Classification
  history:
Meteoritical Bulletin:  MB 92  (2007)  Eucrite-basaltic-an
Recommended:  Eucrite-an    [explanation]

This is 1 of 13 approved meteorites classified as Eucrite-an.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 24 Jul 2007
Writeuphelp
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:
Place of purchase:Rissani, Morocco
Date:Jul-2006
Mass (g):631
Pieces:48
Class:Euc
Type spec mass (g):20.1
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Christophe PICQ   
The Wilcox Collection of Meteorites   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1140 approved meteorites from Algeria (plus 27 unapproved names) (plus 4 impact craters)

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