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Northwest Africa 5787
Basic information Name: Northwest Africa 5787
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5787
Observed fall: No
Year found: 2009
Country: Morocco
Mass:help 48 g
Classification
  history:
Meteoritical Bulletin:  MB 98  (2010)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 431 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 14 May 2010
Writeuphelp
Writeup from MB online:

Northwest Africa 5787 (NWA 5787)

Morocco

Found: Feb 2009

Classification: HED achondrite (Eucrite)

History: Purchased in February 2009 by S. Buhl from a Moroccan dealer in Ouarzazate.

Physical characteristics: A single unweathered stone (48.0 g) almost completely coated by glossy, black fusion crust.

Petrography: (A. Irving and S. Kuehner, UWS): Medium grained aggregate of predominantly exsolved pigeonite and calcic plagioclase, with accessory silica polymorph, Ti-chromite, troilite and minor Ni-free metal. The plagioclase consists of multiple domains of subparallel, ribbon-like microcrystals, suggestive of quenching from shock melt (as in some shergottites). Exsolved pyroxene grains exhibit coarse, parallel lamellae (~0.5 mm wide) of clinopyroxene within host orthopyroxene.

Geochemistry: Orthopyroxene host (Fs48.8-49.2Wo4.0-4.9, FeO/MnO = 26.8-31.8), clinopyroxene exsolution lamellae (Fs22.3-22.6Wo42.7-42.6, FeO/MnO = 27.1-27.2), plagioclase (An91.0-91.1Or0.4).

Classification: Achondrite (eucrite). This specimen has experienced very high shock pressures that resulted in complete melting of plagioclase.

Specimens: A total of 9.6 g and one polished thin section are on deposit at UWS. Main mass, SBuhl

Data from:
  MB98
  Table 1
  Line 36:
Date:Feb 2009
Mass (g):48
Pieces:1
Class:Eucrite
Ferrosilite (mol%):48.8-49.2
Wollastonite (mol%):4.0-4.9
Classifier:A. Irving, S. Kuehner, UWS
Type spec mass (g):9.6
Type spec location:UWS
Main mass:SBuhl
Comments:Submitted by Irving
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)
SBuhl: Meteorite Recon (Mr. S Buhl), Muehlendamm 86, 22087 Hamburg, Germany (private address; updated 14 May 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 98, MAPS 45, 1530-1551 (2010)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Svend Buhl   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1390 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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