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| Northwest Africa 5217 | |||||||||||||||||||||
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| Basic information | Name: Northwest Africa 5217 This is an OFFICIAL meteorite name. Abbreviation: NWA 5217 Observed fall: No Year found: 2007 Country: Morocco Mass:  39.1 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 15 May 2008 | ||||||||||||||||||||
| Writeup |
Writeup from MB 94:
Northwest Africa 5217 Morocco Find: 2007 Achondrite (aubrite) History and physical characteristics: A 39.1 g complete and fully crusted stone was found in Morocco in 2007 and given to the present owner at the Tucson Gem and Mineral Show in January 2008. Petrography: (T. Bunch and J. Wittke, NAU) The fine to medium-grained (<1.2 mm) unbrecciated, cumulate-textured stone is composed essentially of enstatite with interstitial Si-bearing kamacite; sulfides (troilite, daubreelite, brezinaite, oldhamite, alabandite, niningerite, caswellsilverite), graphite, plagioclase, a silica phase, and schöllhornite, a weathering product of caswellsilverite. Weathering grade is low. Mineral compositions: (EMPA analyses, all in wt%) Enstatite is En99.4Fs0.2Wo0.4; metal is Si-rich kamacite (Ni = 5.8–6.6; Si = 3.9–4.5); Oldhamite: S = 38.7, Ca = 59.2, Cr = 1.4, Mn = 1.2; brezinaite: S = 46.0, Cr =54.1; caswellsilverite: S = 45.3, Cr = 38.4, Na = 14.7, Fe = 0.7; troilite: Cr = 2.68, Ti = 3.38; plagioclase: An17Or3.7; and schöllhornite: S = 46.0, Cr = 37.3, Fe = 1.1 (remainder is oxygen and hydrogen). Classification: Achondrite (aubrite). Type specimen: A total of 8.5 g and one thin section are on deposit at NAU. The holder of the main mass is anonymous. | ||||||||||||||||||||
| Data from: MB94 Table 2 Line 97: |
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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) |
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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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