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Northwest Africa 4832
Basic information Name: Northwest Africa 4832
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4832
Observed fall: No
Year found: 2006
Country: Morocco
Mass:help 268 g
Meteoritical Bulletin:  MB 94  (2008)  Aubrite
Recommended:  Aubrite    [explanation]

This is 1 of 76 approved meteorites classified as Aubrite.   [show all]
Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites
Comments: Approved 17 Apr 2008
Writeup from MB 94:

Northwest Africa 4832

Northwest Africa

Find: 2006

Achondrite (aubrite)

History and physical characteristics: Hundreds of platey fragments, the largest weighing 33.1 g, were found in northwest Africa and purchased by A. Aaronson in 2007. The total known weight is 268 g. Fragments tend to break along the preferred orientation plane of constituent enstatite grains. Most of the dark brown pieces are moderately to heavily weathered, a few show small, fresh metal nuggets.

Petrography: (T. Bunch and J. Wittke, NAU) composed mostly of fine-to medium-grained (0.3 to 1.2 mm), euhedral to subhedral cumulate enstatite together with interstitial metal, schreibersite, graphite, FeS, a silica phase present as round inclusions in FeS, daubreelite, brezinaite and very fine-grained intercumulus plagioclase. Much of the metal is oxidized. The stone is unbrecciated with a low shock level.

Mineral chemistry: Enstatite is essentially Fe-free (En99.6Fs0.1Wo0.3). Kamacite contains 4.5 to 5.6 wt% Si and FeS contains 2.6 wt% Ti. The rare mineral brezinaite contains S, 45.2 wt%; Cr, 36.9 to 46.6 wt%; Fe, 18.7 to 9.0 wt% and 1.1 wt% Mn.

Classification: Achondrite (aubrite)

Type specimen: A total of 20.6 g is on deposit at NAU. Aaronson is the main mass holder.

Data from:
  Table 2
  Line 72:
Mass (g):8.3
Shock stage:minimal-moderate
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):2.2
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 1894 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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