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Northwest Africa 4399
Basic information Name: Northwest Africa 4399
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4399
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 210 g
Classification
  history:
Meteoritical Bulletin:  MB 92  (2007)  Acapulcoite
Recommended:  Acapulcoite    [explanation]

This is 1 of 77 approved meteorites classified as Acapulcoite.   [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites
Comments: Approved 24 Jul 2007
Writeuphelp
Writeup from MB 92:

Northwest Africa 4399

Northwest Africa

Find: 2005

Achondrite (acapulcoite)

History: The meteorite was recovered in northwest Africa by an anonymous finder and purchased by Stefan Ralew in Midelt, Morocco in 2005.

Physical characteristics: Many small fragments totaling 210 g were recovered.

Petrography: (A. Greshake, MNB) The meteorite consists dominantly of low-Ca pyroxene, olivine, augite, troilite, metallic Fe-Ni and plagioclase; minor phases include chromite and phosphates. It displays a completely recrystallized texture with abundant 120° triple junctions.

Mineral compositions: Olivine (Fa7.3; range Fa6.5-7.8), low-Ca pyroxene (Fs8.7-9.2Wo2.2-3.2), augite, (Fs3.7-4.4Wo41.3-44.3; up to Cr2O3 = 1.7 wt%). Oxygen Isotopes: (I. A. Franchi and R. C. Greenwood, OU) δ17O = 1.61, δ18O = 4.87, Δ17O = -0.92 (all ‰).

Classification: Achondrite (acapulcoite); minimal shock, extensive weathering. The sample may be paired with NWA 2627.

Type specimens: A total of 20.3 g of sample plus one polished thin section are on deposit at MNB. Ralew holds the main mass.

Data from:
  MB92
  Table 2
  Line 69:
Place of purchase:Tagounite, Morocco
Date:2005
Mass (g):210
Pieces:many
Class:Acp
Type spec mass (g):20.3
Plots: O isotopes:  
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany (institutional address)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Don Edwards   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Charley Kettel   
Dirk Hohmann      
Gregor H.   
Michael Mulgrew   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6984 approved meteorites from (Northwest Africa) (plus 2008 unapproved names)

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