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Northwest Africa 4833
Basic information Name: Northwest Africa 4833
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4833
Observed fall: No
Year found: 2007
Country: Morocco
Mass:help 608 g
Meteoritical Bulletin:  MB 94  (2008)  Lodranite
Recommended:  Lodranite    [explanation]

This is 1 of 91 approved meteorites classified as Lodranite.   [show all]
Search for other: Acapulcoite-lodranite family, Lodranites, and Primitive achondrites
Comments: Approved 17 Apr 2008
Writeup from MB 94:

Northwest Africa 4833

Northwest Africa

Find: 2007

Achondrite (lodranite)

History and physical characteristics: A 608 g dark stone with a dull desert varnish and no remaining fusion crust was found in northwest Africa in 2007 and purchased by A. Aaronson in July 2007.

Petrography: (T. Bunch and J. Wittke, NAU) The stone displays a coarse-grained (olivine grains up to 6 mm) hypidiomorphic texture. Orthopyroxene shows a common lobate grain boundary relationship with olivine. Orthopyroxene is highly decorated with exsolved linear to bleb-shaped diopside (0.002 to 0.04 mm in size) that is oriented parallel to at least three crystal planes of the orthopyroxene host. Olivine is decorated with 0.005– 0.02 mm sized ovoid-shaped microlites of plumose chromite set in anhedral diopside. Mineral modes (vol%) are: olivine = 65, orthopyroxene = 30, metal and oxidized metal = 2, chromite and diopside = 3, no plagioclase was found. The shock level is S3 based on moderate mosaic extinction in olivine and orthopyroxene and minor shock twinning in both.

Mineral compositions: Olivine (Fa10.1; FeO/MnO = 23), orthopyroxene (Fs9.4Wo2.3; FeO/MnO = 14), diopside (Fs8.0Wo45.9; FeO/MnO = 11), metal (2.98 wt% Ni) and FeS Cr = 1.1 wt%. Chromite cr# = 85.

Classification: Achondrite (lodranite).

Type specimen: A 22.2 g sample is on deposit at NAU. A. Aaronson holds the main mass.

Data from:
  Table 2
  Line 73:
Mass (g):60
Shock stage:minimal-moderate
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):12.7
Type spec location:NAU
   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)
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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     This is 1 of 2012 approved meteorites from Morocco (plus 35 unapproved names) (plus 1 impact crater)

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