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| Northwest Africa 4871 | |||||||||||||||||||||
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| Basic information | Name: Northwest Africa 4871 This is an OFFICIAL meteorite name. Abbreviation: NWA 4871 Observed fall: No Year found: 2006 Country: Morocco Mass:  906 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 83 approved meteorites classified as Aubrite. [show all] Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites | ||||||||||||||||||||
| Comments: | Approved 17 Apr 2008 | ||||||||||||||||||||
| Writeup |
Writeup from MB 94:
Northwest Africa 4871 Morocco 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: MB94 Table 2 Line 79: |
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| 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) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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Geography:
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Statistics: This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||
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| Revision history: |
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