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Northwest Africa 4677
Basic information Name: Northwest Africa 4677
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4677
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 156.4 g
Classification
  history:
Meteoritical Bulletin:  MB 92  (2007)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 202 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 24 Jul 2007
Writeuphelp
Writeup from MB 92:

Northwest Africa 4677

Northwest Africa

Find: July 2006

Achondrite (eucrite, monomict)

History: F. Béroud purchased the meteorite in July 2006 at Ste Marie-aux-Mines, France. According to the Moroccan seller, the meteorite was found in the Sahara and other pieces had been previously sold.

Physical characteristics: A single, complete, partially crusted stone weighing 156.4 g.

Petrography: (A. Seddiki, Ud'OEA and UJM; B. Moine, J.Y. Cottin, UJM; B. Devouard, UBP and M. Denise, MNHNP). The rock is brecciated and transected by impact melt veins. Undeformed clasts mostly consist of pyroxene and plagioclase grains (1-4 mm) with a cumulative texture. The pyroxenes are pigeonites with very fine (<1μm) exsolution lamellae. These clasts are embedded in a finer grained clastic matrix of the same nature. Accessory phases include spinel and taenite-kamacite-troilite assemblages and silica.

Mineral compositions and geochemistry: Spinel (Fe,Ti-rich chromite, Cr2O3 = 45 wt%), plagioclase (An91), pigeonite (Fs41.20-42.40Wo7-10), pyroxene (Fe/Mn = 27-32). Kamacite (Ni = 4.9) and taenite (Ni = 38.5-44.6, both wt%).

Classification: Achondrite (eucrite, monomict); S3, minimal weathering. The meteorite is similar to Dhofar 007 and EET 92023.

Type specimens: A type specimen of 20.2 g is on deposit at MNHNP and two sections are kept at UBP. Béroud hold the main mass.

Data from:
  MB92
  Table 2
  Line 120:
Place of purchase:France
Date:Jul-2006
Mass (g):156.4
Pieces:1
Class:Euc
Type spec mass (g):20.2
Institutions
   and collections
MNHNP: Museum National d'Histoire Naturelle, 61 Rue Buffon, LMCM-CP52, 75005 Paris, France, France; Website (institutional address; updated 8 Nov 2012)
UBP: Universite Blaise Pascal, Clermont-Ferrand, France (institutional address)
UJM: Université Jean Monnet, Saint-Etienne, France (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
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Photos:
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Photos from the Encyclopedia of Meteorites:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6286 approved meteorites from (Northwest Africa) (plus 2026 unapproved names)

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