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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: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 642 approved meteorites (plus 1 unapproved name) 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 |
NAU: Geology, Bldg 12
Knoles Dr
Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012) 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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Photos: |
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Geography: |
Statistics: This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names) |