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| Northwest Africa 6445 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 6445 This is an OFFICIAL meteorite name. Abbreviation: NWA 6445 Observed fall: No Year found: 2010 Country: (Northwest Africa) Mass:  571 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 653 approved meteorites (plus 2 unapproved names) classified as CO3. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites | ||||||||||||||||||||||||||||||
| Comments: | Approved 12 Dec 2020 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 109:
Northwest Africa 6445 (NWA 6445) (Northwest Africa) Purchased: 2010 Classification: Carbonaceous chondrite (CO3) History: Purchased by Fabien Kuntz in 2010 from a dealer in Erfoud, Morocco. Petrography: (A. Irving and S. Kuehner, UWS; P. Carpenter, WUSL; T. Bunch and J. Wittke, NAU) Granular chondrules (apparent diameter 390±280 µm, N = 23), sparse, rimmed, amoeboid inclusions and angular mineral fragments are set in a finer grained matrix (~ 20 vol.%, orange in thin section). The amoeboid inclusions are composed of very fine grained hercynite, Al-Ti-diopside, calcite and ilmenite, and are rimmed by a chlorite-like phase. Geochemistry: Olivine (Fa15.4±20.3, range Fa0.2-40.3, N = 5; Cr2O3 in ferroan examples 0.02-0.06 wt.%, mean 0.04±0.02 wt.%, N = 7), low-Ca pyroxene (Fs6.8±5.1Wo2.8±1.9, range Fs1.2-14.6Wo0.9-5.5, N = 7), clinopyroxene (Fs3.5±2.2Wo44.9±3.6, range Fs1.0-5.4Wo41.3-48.4, N = 3), plagioclase (An74.7Or0.8). Classification: Carbonaceous chondrite (CO3). The mean size of chondrules in this specimen is somewhat larger than in most CO chondrites. Typical CAI appear to be absent; the phyllosilicate-rimmed amoeboid inclusions are very unusual and are mineralogically unlike typical CAI. Specimens: 21.0 g plus one polished thin section at PSF; main mass with Kuntz. | ||||||||||||||||||||||||||||||
| Data from: MB109 Table 0 Line 0: |
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| Institutions and collections |
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011) UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011) Kuntz: Fabien Kuntz, France; Website (private 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 Gattacceca J., McCubbin F. M., Grossman J., Bouvier A., Bullock E., Chennaoui Aoudjehane H., Debaille V., D’Orazio M., Komatsu M., Miao B. and Schrader D. L. (2021) The Meteoritical Bulletin, No. 109. Meteoritics & Planetary Science 56, 1626–1630.
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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) | ||||||||||||||||||||||||||||||