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Northwest Africa 5191
Basic information Name: Northwest Africa 5191
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5191
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 26.5 g
Classification
  history:
Meteoritical Bulletin:  MB 94  (2008)  Brachinite
Recommended:  Brachinite    [explanation]

This is 1 of 59 approved meteorites classified as Brachinite.   [show all]
Search for other: Brachinites, Primitive achondrites
Comments: Approved 17 Apr 2008
Writeuphelp
Writeup from MB 94:

Northwest Africa 5191

Northwest Africa

Find: June 2006

Achondrite (brachinite)

History: A single stone was found in 2006 by anonymous finder in northwest African desert.

Physical characteristics: Partially crusted stone of 26.5 g.

Petrography: (A. Ibhi, Laboratory of Petrology, Mineralogy and Materials, Faculty of Sciences, Agadir (LPMM), and M. Van Ginneken and L. Folco, MNA-SI) It is a fine-grained (average grain size in the 100–200 μm range) granoblastic rock, consisting mainly of polygonal olivine, minor polygonal chromite and interstitial augite, and lesser, Fe-sulfide, enstatite and metal. Mafic silicates are devoid of shock features. Although the silicate minerals are fresh, terrestrial weathering has altered some of the primary sulfides and metal to hydroxides, which may also form thin veinlets along grain boundaries.

Geochemistry: Olivine (Fa32.5), augite (Fs10 Wo45).

Classification: Brachinite, S1, moderate weathering. Texture, mineral mode and mineral composition of mafic silicates suggest pairing with NWA 3151.

Type specimen: A total of 26.5 g and one thin section are on deposit at LPMM [IZU], one polished thin section at MNA-SI.

Data from:
  MB94
  Table 2
  Line 95:
State/Prov/County:Northwest Africa
Date:2006
Mass (g):27
Pieces:1
Class:Brachinite
Shock stage:S1
Weathering grade:moderate
Fayalite (mol%):32.5
Ferrosilite (mol%):10
Wollastonite (mol%):45
Classifier:A. Ibhi, LPMM
Type spec mass (g):26.5
Type spec location:Laboratory of Petrology, Mineralogy and Materials, Faculty of Sciences, Agadir (LPMM),
Main mass:Laboratory of Petrology, Mineralogy and Materials Faculty of Sciences Agadir (LPMM)
Institutions
   and collections		 MNA-SI: Museo Nazionale dell'Antartide, Università di Siena, Via Laterina 8, I-53100 Siena, Italy; Website (institutional address; updated 13 Dec 2011)
IZU: Laboratory of Petrology, Mineralogy and Materials, Ibn Zohr University, Faculty of Sciences, Agadir, BP 8106, Morocco (institutional address; updated 12 Feb 2011)
LPMM: Laboratory of Petrology, Mineralogy and Materials, Ibn Zohr University, Faculty of Sciences, Agadir, BP 8106, Morocco (institutional address; updated 16 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)
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Revision
  history:
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