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Northwest Africa 4448
Basic information Name: Northwest Africa 4448
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4448
Observed fall: No
Year found: 2006
Country: Morocco
Mass:help 36.3 g
Meteoritical Bulletin:  MB 99  (2011)  Lodranite
Recommended:  Lodranite    [explanation]

This is 1 of 83 approved meteorites classified as Lodranite.   [show all]
Search for other: Acapulcoite-lodranite family, Lodranites, and Primitive achondrites
Comments: Approved 13 May 2011
Writeup from MB 99:

Northwest Africa 4448 (NWA 4448)


Found: 2005

Classification: Primitive achondrite (lodranite)

History: A stone was recovered from the lower Algerian desert in 2005 and sold in Erfoud, Morocco, in 2006.

Physical characteristics: A partially crusted, 36.3 g stone with a freshly fractured surface.

Petrography: (T. Bunch and J. Wittke, NAU): granoblastic texture with a grain size of 0.05 to 1.7 mm, mean = 0.55 mm. The largest grains are orthopyroxene oikocrysts that enclose rounded olivine chadacrysts. Modal analyses (in vol. %): orthopyroxene, 49 (oikocrysts = 4); olivine, 42; metal, 6; sulfide, chromite, and phosphates, 3. Weathering grade and the shock level are low.

Geochemistry: Orthopyroxene, Fs11.0Wo2.2, FeO/MnO 16-18; orthopyroxene oikocrysts, Fs10.6Wo1.6; olivine, Fa8.5, FeO/MnO = 19 to 23; sulfide Ni 2.36 wt %; metal Ni = 5.4 wt %; chromite cr# = 80; merrillite CaO = 47.5 wt % and P2O5 = 46.3 wt %; apatite CaO = 56.9 wt % and P2O5 = 42.4 wt %; Oxygen isotopes (D. Rumble, CIW): A cleaned and metal-free sample was analyzed by laser fluorination. Replicate analyses are, respectively, δ17O of 0.539 and 0.442; δ18O of 3.551 and 3.413; Δ17O of -1.329 and -1.3534.

Classification: Achondrite (lodranite).

Specimens: 6.3 g and one thin section are on deposit at NAU. The main mass is held by Mr. Aziz Habibi.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Mass (g):36.3
Shock stage:low
Weathering grade:low
Fayalite (mol%):10.6
Ferrosilite (mol%):11.0
Wollastonite (mol%):2.2
Type spec mass (g):7.6
Type spec location:NAU
Main mass:A. Habibi
Comments:Submitted by Bunch
Plots: O isotopes:  
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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     This is 1 of 1548 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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