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| Northwest Africa 13254 | |||||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 13254 This is an OFFICIAL meteorite name. Abbreviation: NWA 13254 Observed fall: No Year found: 2019 Country: Morocco Mass:  237 g | ||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 452 approved meteorites classified as LL3. [show all] Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||||||
| Comments: | Approved 7 Mar 2020 | ||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 109:
Northwest Africa 13254 (NWA 13254) Morocco Purchased: 2019 Classification: Ordinary chondrite (LL3) History: Marc Jost (SJS) purchased the sample from a Moroccan dealer at the Ensisheim show in June 2019. Physical characteristics: Sample is rounded to irregular in shape and has a dark-brown, wind ablated surface. The cut face shows the sample is composed of numerous, closely packed, dark and light colored chondrules surrounded by sulfide rims. Petrography: Description and classification (A. Love, App) Sample displays chondritic texture composed of closely packed, well defined, chemically zoned chondrules (with an average apparent diameter of 775 μm, n=80), surrounded by fine-grained, opaque rims. Chondrules with devitrified mesostasis are more abundant than those with clear isotropic glass. Geochemistry: (A. Love, App) Olivine, Fa16.2±11.6 (Fa0.3-38.6), Fe/Mn=45.9±21.4, n=25. Cr2O3 in type II chondrules has an average of 0.1 wt% with a standard deviation of 0.0, n=23); low-Ca pyroxene, Fs12.6±8.1Wo1.0±0.7 (Fs1.7-3.0Wo0.3-2.7), n=12. Classification: Ordinary chondrite (LL3, C-S2, W1) Based on chondrule size and magnetic susceptibility this sample is an LL chondrite. Estimated subtype for this sample is 3.5 based on unequilibrated compositions, presence of isotropic glass mesostasis (3.4-3.5), lack of yellow CL in chondrule mesostasis (>3.4) and presence of red luminescence in chondrule olivine (>3.1, <3.6). Specimens: Marc Jost (SJS) holds the main mass. A 24.6 g endcut and a polished thin section are on deposit at App. | ||||||||||||||||||||||||||||||||
| Data from: MB109 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) SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:
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Statistics: This is 1 of 1973 approved meteorites from Morocco (plus 37 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||