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Northwest Africa 4883
Basic information Name: Northwest Africa 4883
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4883
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 610 g
Classification
  history:
Meteoritical Bulletin:  MB 93  (2008)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 353 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 14 Jan 2008
Revised 4 Aug 2008: final writeup
Writeuphelp
Writeup from MB 93:

Northwest Africa 4883

Northwest Africa

Find: July 2007

Achondrite (eucrite, polymict)

History: Purchased by G. Hupé in July 2007 from a dealer in Tagounite, Morocco.

Physical characteristics: A single stone (610 g) with thin, dark brown fusion crust, composed of abundant white, cream and dark gray clasts (up to 6 mm), and less abundant clear, pale bluish to colorless maskelynite crystals (up to 1.2 mm), in a finer grained, medium gray matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Complex breccia composed of mineral fragments and lithic clasts in a matrix of the same phases. Mineral fragments include compositionally variable low-Ca pyroxene (mostly unexsolved pigeonite and some orthopyroxene), completely maskelynitized calcic plagioclase, exsolved pigeonite (orthopyroxene with augite lamellae), silica polymorph, ilmenite, chromite, Ni-free metal, and troilite. There also are clasts of both cumulate and basaltic eucrites, and rare Fe-rich clasts composed of ferrosilite ± hedenbergite rimmed by fayalite. Diogenitic orthopyroxene is not abundant and no polycrystalline diogenite clasts were found.

Geochemistry: Pigeonite (Fs30.9-35.1Wo5.8-6.6; FeO/MnO = 28.1-32.5). Pigeonite with rims of ferroan orthopyroxene- Fs55.4Wo2.8; FeO/MnO = 35.3. Ferroan pigeonite (Fs62.6Wo5.6; FeO/MnO = 34.7). Fe-rich, Ca-rich pigeonite (Fs48.0-51.5Wo10.3-15.4; FeO/MnO = 30.3-33.2). Diogenitic orthopyroxene (Fs26.5Wo3.5; FeO/MnO = 29.8). Augite (Fs34.6Wo41.6; FeO/MnO = 35.8) in intergrowth with fayalite (Fa83.6; FeO/MnO = 45.7). Plagioclase (maskelynite, An85.7-88.8Or0.4-0.6).

Classification: Achondrite (polymict eucrite); extensive shock. This specimen is distinctive because the large plagioclase grains have been completely transformed to maskelynite, signifying a higher degree of shock than that experienced by most polymict eucrites and howardites.

Specimens: A total of 20.0 g of sample and one polished thin section are on deposit at UWS. GHupé holds the main mass.

Submitted by: A. Irving, UWS.

Data from:
  MB93
  Table 2
  Line 144:
Place of purchase:Tagounit, Morocco
Date:July 2007
Mass (g):610
Pieces:1
Class:Euc
Type spec mass (g):20
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. 93, MAPS 43, 571-632 (2008)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
The Hupe Collection   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
tett   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7688 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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