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Northwest Africa 3138
Basic information Name: Northwest Africa 3138
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 3138
Observed fall: No
Year found: 2004
Country: Morocco
Mass:help 132 g
Classification
  history:
Meteoritical Bulletin:  MB 89  (2005)  Eucrite
MetBase:  v. 7.1  (2006)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 459 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from MB online:

Northwest Africa 3138

Morocco

Purchased 2004 February

Achondrite (eucrite)

A complete, very fresh stone (132 g; 63 mm x 43 mm x 40 mm) with thin black fusion crust was purchased from a Moroccan dealer at the Tucson Gem and Mineral Show by P. Mani (Mani) in 2004 February.  Classification and mineralogy (A. Irving and S. Kuehner, UWS):  Ophitic texture. Mainly inverted pigeonite and calcic plagioclase (An88.7-89.6Or0.3-0.4) with accessory ilmenite, silica polymorph, Ti-Al-bearing chromite, orthopyroxene (as inclusions within plagioclase), and sparse troilite (mainly as blebs within silica) and altered Ni-poor iron metal.  Pyroxene grains consist of coarse lamellae of augite (Fs30.6Wo37.2., FeO/MnO = 28.1) within orthopyroxene (Fs62.7Wo1.3., FeO/MnO = 33.0), and coarse lamellae of orthopyroxene (Fs62.1Wo1.7., FeO/MnO = 31.1) within augite (Fs23.5Wo42.1., FeO/MnO = 30.6).  Minor secondary calcite laths occur around silica along a crack. Although the pyroxene and plagioclase compositions in this specimen are almost identical to those in NWA 3137, the textures are quite different, and these two stones are not paired.  Specimens: type specimens, 20.7 g, and one polished thin section, UWS; main mass, Philip Mani, 901 Sonterra Blvd., Suite 316, San Antonio, TX  78258.

Data from:
  MB89
  Table 7
  Line 476:
Origin or pseudonym:Morocco
Date:2004
Mass (g):132
Pieces:1
Class:Euc
Ferrosilite (mol%):62.7
Type spec mass (g):20.7
Comments:An88.7-89.6Or0.3-0.4; Augite Fs62.7Wo1.3; Undefined note: UWS means University of Washington, Department of Geological Sciences, Box 351310, Seattle, WA 98195, USA
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 89, MAPS 40, A201-A263 (2005)
Find references in NASA ADS:
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1460 approved meteorites from Morocco (plus 21 unapproved names) (plus 1 impact crater)

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