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| Northwest Africa 12904 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 12904 This is an OFFICIAL meteorite name. Abbreviation: NWA 12904 Observed fall: No Year found: 2018 Country: Morocco Mass:  71.1 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 15 approved meteorites classified as LL4-5. [show all] Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||
| Comments: | Approved 21 Sep 2019 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 108:
Northwest Africa 12904 (NWA 12904) Morocco Purchased: 2018 Classification: Ordinary chondrite (LL4-5) History: Purchased by Matthew Stream at the 2018 Tucson Gem Show in Tucson, AZ. Physical characteristics: Single stone with dark-brown fusion crust. Petrography: (Daniel Sheikh, FSU) Low chondrule abundance (900±100 µm, n=4). Sample composed of both type 4 and type 5 clasts present in a dark, fine-grained matrix. Major phases present include olivine, low-ca pyroxene, high-ca pyroxene, recrystallized sodic plagioclase (only in type 5 clasts, average size 5 µm), troilite, Fe-Ni metal, and chromite. Geochemistry: Olivine (Fa30.6±0.8, n=40), Low-Ca Pyroxene (Fs25.5±0.6 Wo1.8±0.5, n=5), High-Ca Pyroxene (Fs10.5±0.5 Wo43.2±0.3, n=4), Sodic Plagioclase (An12.4±0.3, n=4). Classification: Ordinary Chondrite (LL4-5) Sample is classified as type 4-5 due to the homogeneity of the olivine and pyroxene grains and the absence of recrystallized plagioclase in the type 4 clasts as well as the homogeneity of the olivine and pyroxene grains and the presence of 5 µm recrystallized plagioclase in the type 5 clasts. Specimens: 14.94 grams at UCLA; main mass with Matthew Stream. | ||||||||||||||||||||||||||||||
| Data from: MB108 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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography:
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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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