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Northwest Africa 8720 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 8720 This is an OFFICIAL meteorite name. Abbreviation: NWA 8720 Observed fall: No Year found: 2014 Country: Morocco Mass: 77.1 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 68 approved meteorites classified as R4. [show all] Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7) | ||||||||||||||||||||||||||||||
Comments: | Approved 2 Feb 2015 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 104:
Northwest Africa 8720 (NWA 8720) Morocco Purchased: Oct 2014 Classification: Rumuruti chondrite (R4) History: Purchased from a dealer in Morocco in October 2014 by A. Jonikas. Physical characteristics: One stone with black fusion crust. Cut surface reveals well defined chondrules scattered within a light-brown matrix. Petrography: (A. Rubin and J. Breen, UCLA) Microprobe examination of a polished mount shows low-Ca pyroxene exhibits only minor polysynthetic twinning. Small grains of pyrrhotite are present. The rock is moderately recrystallized, consistent with type 4. The mean olivine Fa content indicates that it is an R chondrite. Mean chondrule size is ~400 μm, also consistent with R. Geochemistry: Olivine, Fa38.5±0.3 (n=16); low-Ca pyroxene, Fs23.4±5.4Wo1.0±0.6 (n=10); Ca-pyroxene, Fs9.5Wo46.3 (n=2) Classification: Rumuruti Chondrite (R4), Wi2 based on weathering index as published in Rubin and Huber (2005) Specimens: 16.40 g on deposit at UCLA, A. Jonikas holds the main mass. | ||||||||||||||||||||||||||||||
Bibliography: |
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Data from: MB104 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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Geography: |
Statistics: This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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