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Northwest Africa 4503 | |||||||||||||
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Basic information | Name: Northwest Africa 4503 This is an OFFICIAL meteorite name. Abbreviation: NWA 4503 Observed fall: No Year found: 2007 Country: (Northwest Africa) Mass: 70 g | ||||||||||||
Classification history: |
This is 1 of 106 approved meteorites classified as Lunar. [show all] Search for other: Lunar meteorites | ||||||||||||
Comments: |
Approved 14 Jan 2008 Revised 4 Aug 2008: final writeup | ||||||||||||
Writeup |
Writeup from MB 93:
Northwest Africa 4503 Northwest Africa Find: 2007 Achondrite (lunar, anorthositic breccia) History and Physical characteristics: A 70 g partially crusted stone was purchased in January 2007 by A. Aaronson and sold to a collector in July 2007. The fusion crust is dark to light brown and vermillion in translucent areas. Petrography: (T. Bunch, J. Wittke, NAU; A. Irving, UWS) This feldspathic melt breccia is dominated by very fine- to medium-grained anorthositic lithologies that are typically enriched in olivine (anorthositic troctolites and gabbros) together with a large fraction of plagioclase, olivine, and exsolution-textured pyroxene fragments. Shock-melt clasts, K-, Ba-rich glasses, and fayalite-pyroxene-quartz igneous lithologies are also present. One granophyre clast shows a granophyric or micrographic texture of oriented quartz inclusions in alkali feldspar surrounded by shock-melted plagioclase. Most of the matrix is glassy and vesicular with included mineral fragments. Weathering effects are minimal. Mineral compositions: Gabbro: olivine (Fa34.8; FeO/MnO = 88), augite (Fs14.6Wo41.8; FeO/MnO = 42), plagioclase (An97.6), chromite (cr# = 74). Troctolite: olivine (Fa27.9; FeO/ MnO = 83). Norite: orthopyroxene (Fs24.8Wo2.5; FeO/ MnO = 55), augite (Fs20.4Wo38.9). Basaltic pyroxene fragments, host = Fs46.9Wo2.4, exsolution lamellae = Fs19.8Wo43.4. Granophyre K-feldspar (Or72Ab18.3). Classification: Achondrite (lunar, anorthositic breccia). Type specimens: A total of 14 g is on deposit at NAU. The main mass holder is anonymous. Submitted by: T. Bunch, NAU. | ||||||||||||
Data from: MB93 Table 2 Line 59: |
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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) UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 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. 93, MAPS 43, 571-632 (2008)
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Geography: |
Statistics: This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names) | ||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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