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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
Meteoritical Bulletin:  MB 92  (2007)  Acapulcoite
Recommended:  Acapulcoite    [explanation]

This is 1 of 86 approved meteorites classified as Acapulcoite.   [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites
Comments: Approved 24 Jul 2007
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:
  Table 2
  Line 69:
Place of purchase:Tagounite, Morocco
Mass (g):210
Type spec mass (g):20.3
Plots: O isotopes:  
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
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)
References: Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
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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 Photo added 19 Apr 2022
Dirk Hohmann      
Gregor H.   
Michael Mulgrew Photo added 19 Apr 2022

     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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