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| Northwest Africa 4663 | |||||||||||
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| Basic information | Name: Northwest Africa 4663 This is an OFFICIAL meteorite name. Abbreviation: NWA 4663 Observed fall: No Year found: 2006 Country: (Northwest Africa) Mass:  564 g | ||||||||||
| Classification history: |
This is 1 of 94 approved meteorites classified as Lodranite. [show all] Search for other: Acapulcoite-lodranite family, Lodranites, and Primitive achondrites | ||||||||||
| Comments: |
Approved 1 Jan 2008 Revised 17 Dec 2008: Erratum to oxygen isotopes; 2008-08-04: final writeup | ||||||||||
| Writeup |
Writeup from MB 93:
Northwest Africa 4663 Northwest Africa Find: 2006 Achondrite (lodranite) History and Physical characteristics: A 564 g dark stone with desert varnish with almost no fusion crust was found in the Sahara in 2006 and purchased by A. Aaronson in October 2006. Petrography: (T. Bunch and J. Wittke, NAU) Protogranular texture with a grain size (metal excluded) of 0.2 to 1.65 mm; the mean is 0.9 mm. Metal grains are as large as 2.2 mm, the mean is 1.25 mm. Oikocrysts of orthopyroxene enclose olivine, a poikilitic texture, and Ca pyroxene contains very thin (<0.002 mm) orthopyroxene exsolution lamellae. Irregular patches of vermicular FeS (<0.01 mm) occur mostly within orthopyroxene. Mineral modes (vol%) are: orthopyroxene = 36, olivine = 30, metal and oxidized metal = 17, troilite = 8, diopside = 8, and plagioclase = 1. Mineral compositions and Geochemistry: Orthopyroxene (Fs10.0-10.3Wo2.2-2.8; FeO/MnO = 13), olivine (Fa5.4-6.1; FeO/ MnO = 17), diopside (Fs4.3Wo45.9), metal (Ni = 4.7- 10.3 wt%) and plagioclase (An20Or2.7). Oxygen isotopes: (D. Rumble, CIW) A cleaned and metal-free sample was analyzed by laser fluorination. Replicate analyses are respectively, δ17O = -1.025 and -0.917; δ18O = 1.15 and 1.20; Δ17O = 4.13 and 4.01 (all ‰). Classification: Achondrite (lodranite); minimal shock and minimal to moderate weathering. Type specimens: A 23 g sample is on deposit at NAU*. Aaronson holds the main mass. Submitted by: T. Bunch, NAU. Writeup from MB 94: Correction: δ17O = 1.144, 1.202; δ18O = 4.125, 4.015; Δ17O = -1.025,-0.910 (all ‰). | ||||||||||
| Data from: MB113 Table 0 Line 0: |
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| Data from: MB93 Table 2 Line 90: |
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| Plots: | O isotopes: | ||||||||||
| Institutions and collections |
NAU*: Collection discontinued. Specimens redistributed as shown in individual meteorite records, United States (institutional address; updated 24 Jun 2024) UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023) Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010) CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address) NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States (institutional address; updated 12 Apr 2012) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 93, MAPS 43, 571-632 (2008) Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008) Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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| Photos: |
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| Geography: |
Statistics: This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names) | ||||||||||