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Northwest Africa 15641
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:help 3.36 kg
Meteoritical Bulletin:  MB 112  (2024)  CK5-6
Recommended:  CK5-6    [explanation]

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 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:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P August 2020
Mass (g):3359
Shock stage:S2
Weathering grade:low
Fayalite (mol%):32.8±0.3
Classifier:D. Sheikh, Cascadia
Type spec mass (g):21
Type spec location:Cascadia
Main mass:Jasper Spencer
Comments:CML 1494; submitted by Daniel Sheikh
   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)
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Cartier C., Consolmagno G., Goodrich C., Greshake A., Gross J., Joy K. H., Miao B. and Zhang B. (2024) The Meteoritical Bulletin, no. 112. Meteoritics & Planetary Science 59, 1820–1823. ?
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     This is 1 of 9825 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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