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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 56 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 Photo added 20 Oct 2022
Dirk Hohmann         
Gerald Armstrong Photo added 20 Oct 2022
Jean-Michel Masson Photo added 20 Oct 2022
METEORITICON   
Michael S. Scherman   
Robert Zdancewicz Photo added 20 Oct 2022
Ryan Upchurch   
Woreczko Jan & Wadi   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1236 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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