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Northwest Africa 8457 | |||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 8457 This is an OFFICIAL meteorite name. Abbreviation: NWA 8457 Observed fall: No Year found: 2014 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 21 approved meteorites classified as LL3.2. [show all] Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||||||
Comments: | Approved 4 Jul 2014 | ||||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 103:
Northwest Africa 8457 (NWA 8457) (Northwest Africa) Purchased: 2014 Classification: Ordinary chondrite (LL3.2) History: A partially crusted stone weighing 54.6 g was found in Morocco and purchased by Blaine Reed at the Tucson Gem and Mineral Show in February of 2014 Physical characteristics: Sample is irregularly shaped and contains minor amounts of weathered fusion crust. Petrography: Description and classification (A. Love, App): Sample is dark-colored and displays numerous close-packed large (up to 2.5 mm) unequilibrated chondrules (avg. dia. 702 μm). Chondrules commonly contain mesostasis that displays yellow CL (44%) and blue CL (53%). Many chondrules display fine-grained rims composed of clastic and amorphous silicate and metal materials. Sample contains many Fe-Oxides and a single irregular-shaped metal grain composed of rounded taenite nodules with surrounded by rims of kamacite and troilite. Geochemistry: (A.Love, App) Fa12.0±7.4 (Fa0.0-29.3 n=23), Fe/Mn=53.68, Cr2O3 in ferroan olivine is 0.28±0.09 wt%; Low Ca pyroxene Fs8.4±7.6Wo1.6±1.5, N=8. Classification: Ordinary Chondrite (LL3.2 S3 W3). LL based on chondrule diameter and Fe/Mn ratios in olivine. Estimation of subtype based on mean content and variability of wt% Cr2O3 in ferroan olivine after Grossman and Brearley (2005) and CL signature of chondrule olivines and mesostasis of Huss et al. (2006). Specimens: A 10.95 g type specimen and one polished thin section are on deposit at App. | ||||||||||||||||||||||||||||||||
Bibliography: |
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Data from: MB103 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) Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography: |
Statistics: This is 1 of 8420 approved meteorites from (Northwest Africa) (plus 1900 unapproved names) |