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| Northwest Africa 13123 | |||||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 13123 This is an OFFICIAL meteorite name. Abbreviation: NWA 13123 Observed fall: No Year found: 2014 Country: Morocco Mass:  44.2 g | ||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 589 approved meteorites (plus 1 unapproved name) classified as CV3. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites | ||||||||||||||||||||||||||||||||
| Comments: | Approved 19 Mar 2022 | ||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 111:
Northwest Africa 13123 (NWA 13123) Morocco Purchased: 2014 Classification: Carbonaceous chondrite (CV3) History: Sample was purchased at the Denver mineral show in 2014 from Said Haddany, who acquired it from Morocco. Sample is catalogued at the ROM as M58923. Physical characteristics: Dark, rounded individual showing abundant chondrule sockets, mature desert polish, with no fusion crust. Magnetic susceptibility of the 34.08 g cut main mass is log χ (× 10-9 m3/kg) = 4.03. Petrography: Cut surfaces show abundant chondrules and AOA, CAI bearing dark fine-grained rims in a brown matrix (40 vol%). Metal appears to be absent. In polished thin section, matrix is slightly recrystallized, but all clastic components bear dark brown fine-grained rims. Chondrules and fragmented chondrules of POP, granular olivine and BO types are readily defined, and average 677±187 µm (n=18) diameter, typically having igneous rims. CAIs (10 vol%) and AOA (<5 vol%) are also abundant. Olivine and pyroxene typically show sharp extinction. In reflected light, sulfide is abundant, mainly as rounded inclusions in POP chondrules and in chondrule rims. Accessory magnetite is present in matrix and in rims. A large 1 mm metal grain of kamacite and taenite is present, altered to Fe-oxides around its rim. In BSE images, AOA olivine shows zoning to bright Fe-rich rims and chondrule olivine is strongly Mg-rich with slight, patchy variation. In X-ray maps, Fe and Ni are strongly concentrated in matrix and rim finely crystalline phases, as well as in sulfides within chondrules, but Fe is nearly absent from chondrule silicates. Geochemistry: EPMA: Olivine Fa5.97±12.05 (n=30); chondrule olivine Fa2.97±1.91 (n=24); Ca-poor pyroxene Fs1.01±0.81Wo0.22±0.77 (n=20); Ca-rich pyroxene Fs1.07±0.78Wo41.99±7.71 (n=12). Magnetite compositions (wt%): Cr2O3=2.62±3.08, TiO2=0.10±0.15, NiO=0.07±0.08, Al2O3=0.73±0.39 (n=20). Classification: CV3, low shock, W1. CV3 type is indicated by CAI and AOA abundance, magnesium-rich chondrule olivine compositions, high variation in non-chondrule olivine composition and magnetite compositions showing low Ti, Ni and Al content. In X-ray maps, BSE images and EPMA data, the meteorite appears to be highly unequilibrated. Specimens: Type specimen ROM; main mass DGregory | ||||||||||||||||||||||||||||||||
| Data from: MB111 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) DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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Geography:
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Statistics: This is 1 of 1847 approved meteorites from Morocco (plus 24 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||