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Northwest Africa 11117 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 11117 This is an OFFICIAL meteorite name. Abbreviation: NWA 11117 Observed fall: No Year found: 2016 Country: (Northwest Africa) Mass: 68 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 840 approved meteorites (plus 2 unapproved names) classified as L3. [show all] Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||||
Comments: | Approved 7 Feb 2017 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 106:
Northwest Africa 11117 (NWA 11117) Northwest Africa Purchased: 2016 Classification: Ordinary chondrite (L3) History: One partially crusted stone weighing 68 g was purchased by Thomas Webb from a prospector in Morocco in January 2016. Physical characteristics: The oriented sample is irregularly shaped and contains minor amounts of weathered fusion crust. There are a few cracks in the fusion crust that expose light-colored chondrules surrounded by a dark-colored matrix. Petrography: Description and classification (A. Love, App): Sample is dark-colored and displays numerous close-packed unequilibrated chondrules of varying size (avg. dia. 433 μm (78-1361 μm), n=74). Porphyritic chondrules display well-developed zoning. Chondrule mesostasis is turbid and isotropic glass is common. Some chondrules contain relict grains. Many chondrules display fine-grained rims composed of clastic and amorphous silicate and metal materials. Some fine-grained chondrule rims contain porphyritic-textured microchondrules (diameters as small as 50 μm) occurring within clastic material. Geochemistry: Olivine: Fa13.2±7.6 (Fa1.1-29.3) N=34, Fe/Mn=47.1±16, ferroan olivine - Fa17.5±4.8, Cr2O3 in ferroan olivines is 0.5±0.1 wt% (0.3-0.8) n=17; low Ca-pyroxene: Fs19.0±12.1Wo1.6±1.3 (Fs2.4-44.9, N=20). Classification: Ordinary Chondrite (L3) S2 W1. Based on Fe/Mn=47 in olivines, sample is an L chondrite. Based on Fa values and range of Cr2O3 contents within ferroan olivines, the sample is L≥3.00 (Grossman and Brearley, 2005). Abundant porphyritic chondrules display yellow CL, olivines with bright red CL and red CL of matrix materials suggests sample is L<3.1, (Huss et al., 2006). Common isotropic glass in mesostasis is indicate petrologic grade of L<3.3. Specimens: Webb holds the main mass. Two slices weighing 12.74 g and a polished thin section are on deposit at App. | ||||||||||||||||||||||||||||||
Bibliography: |
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Data from: MB106 Table 0 Line 0: |
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Institutions and collections |
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013) TWebb: No contact information provided., United States (private address) |
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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 9627 approved meteorites from (Northwest Africa) (plus 1865 unapproved names) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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