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| Northwest Africa 15641 | |||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 15641 This is an OFFICIAL meteorite name. Abbreviation: NWA 15641 Observed fall: No Year found: 2020 Country: (Northwest Africa) Mass:  3.36 kg | ||||||||||||||||||||||||||
| Classification history: |
This is 1 of 2 approved meteorites classified as CK5-6. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites | ||||||||||||||||||||||||||
| Comments: | Approved 29 Jan 2023 | ||||||||||||||||||||||||||
| Writeup |
Writeup from MB 112:
Northwest Africa 15641 (NWA 15641) (Northwest Africa) Purchased: August 2020 Classification: Carbonaceous chondrite (CK5-6) History: Purchased by Jasper Spencer from a meteorite dealer in Morocco in August 2020. Physical characteristics: Multiple stones with fusion crust; variable clast abundances within different stones. Petrography: (D. Sheikh, Cascadia) Sample is heterogeneous in clast distribution; from the polished thin section analyzed, it represents a breccia comprised of mm to cm-sized sub-rounded lithic clasts and refractory inclusions, and few chondrules (Av. ~1 mm) set within a fine-grained host matrix. Accessory phases include secondary recrystallized feldspar (varies across sample from <10 μm in some areas to >60 μm in others), pentlandite and Cr-bearing magnetite. Geochemistry: Olivine (Fa32.8±0.3, range Fa32.3-33.2, NiO wt. % =0.5±0.1, n=7), High-Ca Pyroxene (Fs9.0±4.4Wo46.1±5.6, range Fs1.5-13.9Wo34.8-49.2, n=7), Plagioclase (An24.7±3.4, range An19.8-27.4, n=4), Magnetite (Cr2O3 wt. % =3.8±0.3, n=7). Classification: Carbonaceous Chondrite (CK4-6). Based on the representative classification that best encompasses the textural and compositional features of silicates from some of the larger clasts in the section, as well as from the host matrix. Specimens: 21 g at Cascadia, main mass with Jasper Spencer. | ||||||||||||||||||||||||||
| Data from: MB112 Table 0 Line 0: |
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| Institutions and collections |
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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| Geography: |
Statistics: This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||