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Northwest Africa 4871
Basic information Name: Northwest Africa 4871
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4871
Observed fall: No
Year found: 2006
Country: Morocco
Mass:help 906 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 4871


Find: 2006

Achondrite (aubrite)

History and physical characteristics: Sixty-one pieces with a total weight of 906 g were purchased in Tagounite, Morocco in May 2007. Most of the stones are medium to dark brown with some remnant fusion crust.

Petrography: (T. Bunch and J. Wittke, NAU) A brecciated cumulate rock with clasts as large as 2 cm. The intact lithology is dominated by subhedral to anhedral polysynthetically twinned enstatite with fine-grained intercumulus intergrowths of feldspathic glasses and a silica phase. Other minerals include graphite, FeS, daubreelite, schreibersite, niningerite, perryite as exsolution lamellae in Si-bearing kamacite and Zn-bearing brezinaite. Large clasts show a multitude of sub-parallel, closely spaced compression fractures. Shock level is S3 and the weathering grade is W5 for small pieces (<3 cm) and W3 for the interiors of larger specimens.

Mineral compositions: Enstatite is essentially Fe-free (Fs0.1Wo0.3), kamacite Si content is 3.1 to 3.6 wt% and perryite is (in wt%): Si, 12.4; Fe, 4.5; Ni, 77.5 and P, 3.8. ferroan brezinaite is (in wt%): Cr, 43.2; S, 44.1; Fe, 6.3; Mn, 1.2; Zn, 5.1.

Classification: Achondrite (aubrite), possibly paired with NWA 4799.

Type specimen: A total of 22.3 g is on deposit at NAU. Aaronson holds the main mass.

Data from:
  Table 2
  Line 79:
Date:July 2007
Mass (g):115
Shock stage:minimal-moderate
Weathering grade:moderate
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):20.3
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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