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Northwest Africa 13363 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13363 This is an OFFICIAL meteorite name. Abbreviation: NWA 13363 Observed fall: No Year found: 2020 Country: Algeria Mass: 54 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 50 approved meteorites classified as Angrite. [show all] Search for other: Achondrites, Angrites | ||||||||||||||||||||||||||||||
Comments: | Approved 7 Jul 2020 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 109:
Northwest Africa 13363 (NWA 13363) Algeria Find: 2020 Jan Classification: Angrite History: Found in January 2020 by Ali Muftah in Algeria. Later purchased from Ali Muftah in March 2020 by Youssef Bennani. Physical characteristics: Sample is a single stone covered with a relatively fresh, dark-gray fusion crust containing visible vesicles. Petrography: (D. Sheikh, FSU) This sample exhibits a fine-grained, subophitic texture (grain size up to 200µm, Av. 100µm) composed primarily of twinned anorthite laths, Al-Ti-rich augite, and Ca-rich olivine (some are polycrystalline). Al-Ti-rich augite and Ca-rich olivine grains often display strong compositional zoning; in the case of Ca-rich olivine, several grains are rimmed by kirschsteinite. Accessory mineral phases include Al-bearing titanomagnetite and troilite. Vesicles are visible throughout the thin section. Geochemistry: Olivine (Fa50.6±15.1 Ln4.4±5.4, range Fa32.2-79.7 Ln1.2-20.3, FeO/MnO = 79±12, n=38), Kirschsteinite (Fa61.2±1.4Ln33.7±1.4, range Fa60.3-62.8Ln32.3-34.9, FeO/MnO = 70±12, n=3), Al-Ti-rich augite (Fs30.9±12.1Wo51.1±0.9, range Fs19.1-49.0Wo49.3-52.7, Al2O3 wt% = 7.0±1.0, TiO2 wt% = 2.6±1.4, FeO/MnO = 101±13, n=17), Anorthite (An99.6±0.2, range An99.4-99.8, n=20). Classification: Angrite. The Fe/Mn ratio and presence of anorthite, Ca-rich olivine, kirschsteinite, Al-Ti-rich augite, and vesicles in the sample point to the Angrite meteorite group. Specimens: 11.2 grams at UCLA; main mass with Youssef Bennani. | ||||||||||||||||||||||||||||||
Data from: MB109 Table 0 Line 0: |
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Institutions and collections |
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011) FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography: |
Statistics: This is 1 of 1336 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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