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Northwest Africa 4875
Basic information Name: Northwest Africa 4875
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4875
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 904 g
Classification
  history:
Meteoritical Bulletin:  MB 94  (2008)  Lodranite
Recommended:  Lodranite    [explanation]

This is 1 of 81 approved meteorites classified as Lodranite.   [show all]
Search for other: Acapulcoite-lodranite family, Lodranites, and Primitive achondrites
Comments: Approved 17 Apr 2008
Writeuphelp
Writeup from MB 94:

Northwest Africa 4875

Northwest Africa

Find: 2007

Achondrite (lodranite)

History and physical characteristics: A 904 g dark brown stone was purchased by A. Aaronson in Morocco in July 2007. The irregular-shaped stone has no remnant fusion crust and has been desert-polished.

Petrography: (T. Bunch and J. Wittke, NAU) This coarse-grained harzburgite-like specimen is brecciated and contains olivine and orthopyroxene grains of ~equal size (up to 5 mm in diameter). In addition, intact lithologic clasts contain minor interstitial clinopyroxene, kamacite, troilite, and pentlandite, no plagioclase was found. Olivine shows small (<0.02 mm), randomly oriented irregular- to ovoid-shaped inclusions of chromite and diopside. Some of these inclusions exhibit a symplectitic relationship with host olivine. Orthopyroxene has twin lamellae and tiny metal and sulfide inclusions oriented parallel to the (100) crystallographic plane. Oxidation of kamacite is extensive and imparts a dark stain throughout the sample. Shock level is S3.

Mineral compositions: Olivine is Fa10.3 and FeO/MnO = 24; orthopyroxene is Fs9.6Wo1.4 and FeO/MnO = 14; clinopyroxene is Fs3.6Wo45.7 and contains 1.35 wt% Cr2O3. Chromite cr# is 84 and troilite contains 2.5 to 5.4 wt% Ni.

Classification: Achondrite (lodranite), possibly paired with NWA 4478, but not with NWA 4833.

Type specimen: A total of 21.2 g is on deposit at NAU. A. Aaronson holds the main mass.

Data from:
  MB94
  Table 2
  Line 81:
State/Prov/County:Erfoud
Date:July 2007
Mass (g):900
Pieces:1
Class:Lodranite
Shock stage:minimal-moderate
Weathering grade:moderate
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):22
Type spec location:NAU
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. 94, MAPS 43, 1551-1588 (2008)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7308 approved meteorites from (Northwest Africa) (plus 1977 unapproved names)

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