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| Northwest Africa 12349 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 12349 This is an OFFICIAL meteorite name. Abbreviation: NWA 12349 Observed fall: No Year found: 2017 Country: Morocco Mass:  522 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 6400 approved meteorites (plus 2 unapproved names) classified as H4. [show all] Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||
| Comments: | Approved 27 Nov 2018 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 107:
Northwest Africa 12349 (NWA 12349) Morocco Purchased: 2017 Feb Classification: Ordinary chondrite (H4) Physical characteristics: A dark-brown to black fusion crust with regmaglypts is observed over approximately 80% of the exterior. Faint chondrules set in a brown-orange matrix are observed on the saw-cut face. Petrography: (T.V. Kizovski, ROM) In thin section and in backscattered electron view, chondrules are discernible with opaque boundaries set in a semi-recrystallized matrix. The chondrules vary in size with an average diameter of 0.4 mm (n = 41). The majority of the chondrules are porphyritic and are mainly comprised of pyroxene with varying amounts of olivine and devitrified glass. Barred olivine and cryptocrystalline chondrules are also observed. The matrix is mainly composed of iron oxide with some devitrified glass, pyroxene, terrestrial barite, and rare metal. The stone shows multiple signs of significant desert weathering. Several cracks, approximately 0.03 mm in width, cross-cut the sample and appear to be filled with terrestrial weathering products. The metals and sulfides in the matrix have been completely oxidized, although there has been no alteration of silicates. Subtle undulatory extinction is observed in the olivine and pyroxene grains. Plagioclase is rare, and only observed in the porphyritic chondrules. Geochemistry: (EMPA, M. Beauchamp, UWO) Olivine (Fa19.5±0.1; Fe/Mn = 37.6±1.6; n=10), low-Ca pyroxene (Fs16.3±1.4Wo1.4±1.1; Fe/Mn = 25.7±7.1; n=10), plagioclase (An8.8±4.7Ab78.1±12.7Or13.1±16.5; n=6). Classification: Ordinary Chondrite (H4, S2, W4) Specimens: 23.2 g including a thin section at UWO. S. Tutorow holds the main mass. | ||||||||||||||||||||||||||||||
| Data from: MB107 Table 0 Line 0: |
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| Institutions and collections |
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011) UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 2015) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Geography:
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Statistics: This is 1 of 1932 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||