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Northwest Africa 11476 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 11476 This is an OFFICIAL meteorite name. Abbreviation: NWA 11476 Observed fall: No Year found: 2017 Country: (Northwest Africa) Mass: 2.21 kg | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 12 approved meteorites classified as R3-4. [show all] Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3) | ||||||||||||||||||||||||||||||
Comments: | Approved 24 Dec 2017 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 106:
Northwest Africa 11476 (NWA 11476) (Northwest Africa) Purchased: 2017 Classification: Rumuruti chondrite (R3-4) History: The meteorite was bought from a local meteorite dealer in Morocco. Physical characteristics: Three individuals partly covered by fusion crust and three sand blasted fragments lacking any fusion crust. Petrography: The meteorite displays a dark-grayish interior and is composed of up to 4-cm sized mostly angular type 3 clasts and matrix; some clasts are dark brownish. The matrix is dominated by Fe-rich olivine and less abundant partly unequilibrated low-Ca pyroxene, augite and sodic feldspar. Olivine and low-Ca pyroxene in the clasts are highly unequilibrated. Chondrules are 100 to 900 µm with an average of about 400 µm. One spinel-rich chondrule has been found. Minor phases include pentlandite, sodic plagioclase, and Ca-pyroxene; no metal has been detected. The meteorite contains shock melt veins. Geochemistry: olivine in matrix: Fa40.9±0.4, n=10; low-Ca pyroxene in matrix: Fs22.3±8.3Wo0.8±0.5 (Fs8.5-33.2Wo0.3-1.6, n=11); olivine in type 3 clasts: Fa29.5±12.3 (Fa1.1-45.1, n=26); low-Ca pyroxene in type 3 clasts: Fs16.6±10.2Wo2.0±1.1 (Fs4.5-34.2Wo0.5-4.4, n=22) | ||||||||||||||||||||||||||||||
Data from: MB106 Table 0 Line 0: |
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Institutions and collections |
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011) |
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Catalogs: |
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References: | Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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Geography: |
Statistics: This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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