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Northwest Africa 4664
Basic information Name: Northwest Africa 4664
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4664
Observed fall: No
Year found: 2006
Country: Algeria
Mass:help 20 kg
Classification
  history:
Meteoritical Bulletin:  MB 93  (2008)  Diogenite-pm
Recommended:  Diogenite-pm    [explanation]

This is 1 of 37 approved meteorites classified as Diogenite-pm.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 1 Jan 2008
Revised 4 Aug 2008: final writeup
Writeuphelp
Writeup from MB 93:

Northwest Africa 4664

Algeria

Find: 2006

Achondrite (diogenite, polymict breccia)

History and Physical characteristics: Many stones that weigh ~20 kg were purchased in Rissani, Morocco, in July 2006 by A. Aaronson and are part of a large strewn field in which at least 30 kg have been recovered.

Petrography: (T. Bunch and J. Wittke, NAU) A moderately shocked diogenite cataclastic breccia. Samples range from very matrix-rich to those that are matrix-poor and are composed of closely packed clasts. Mineral modes (vol%): orthopyroxene = 92, olivine = 4, plagioclase = 2, augite = 2, chromite and FeS = 1. Trace amounts of silica and metal are also present. The sample has at least two lithologies: one contains orthopyroxene with lowest FeO and without olivine; the other contains olivine with slightly more FeO-rich orthopyroxene. Orthopyroxene grains show minor amounts of shock lamellae and well-developed undulatory extinction. Plagioclase is partially isotropic.

Mineral compositions and Geochemistry: Orthopyroxene (Fs17.8-23Wo1.1-2.8; FeO/MnO = 30-37), olivine (Fa24.1-32.6; FeO/MnO = 52-56), plagioclase (An79), chromite (Cr/(Cr + Al) = 0.67).

Classification: Achondrite (diogenite, polymict breccia); moderate shock, minimal weathering. Most likely paired with NWA 4473.

Type sample: A 34 g sample is on deposit at NAU. Aaronson holds the main mass.

Submitted by: T. Bunch, NAU.

Data from:
  MB93
  Table 2
  Line 91:
Place of purchase:Rissani, Morocco
Date:2006
Mass (g):20 kg
Pieces:Many
Class:Dio
Type spec mass (g):34
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
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:
Mike Farmer   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Aeroliths Collection Theodossiou   
Gerald Armstrong   
Jean-Michel Masson   
METEORITICON   
Michael S. Scherman   
Robert Zdancewicz   
Woreczko Jan & Wadi   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 770 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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