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Northwest Africa 15774
Basic information Name: Northwest Africa 15774
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15774
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 174 kg
Meteoritical Bulletin:  MB 112  (2024)  CK3
Recommended:  CK3    [explanation]

This is 1 of 88 approved meteorites classified as CK3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites
Comments: Approved 4 Mar 2023
Writeup from MB 112:

Northwest Africa 15774 (NWA 15774)

(Northwest Africa)

Purchased: 2022

Classification: Carbonaceous chondrite (CK3)

History: Purchased by Adam Aaronson in 2022.

Physical characteristics: Flight-shaped stone with regmaglypts, dark fusion crust on exterior with patches of caliche. Broken surface reveals numerous distinct chondrules set in a dark colored, fine-grained matrix. Scattered CAIs are visible throughout.

Petrography: (C. Agee, UNM) This meteorite has primarily type-II porphyritic olivine chondrules and type-I porphyritic pyroxene chondrules. Most chondrules have glass or mesostasis. Ubiquitous chromium-bearing magnetite was observed, often decorating chondrules. No metals or sulfides were detected.

Geochemistry: (A. Ross, UNM) Olivine Fa18.8±16.9, Fe/Mn=103±51, Cr2O3= 0.09±0.09 (wt%), n=10; diopside Fs5.2±5.3Wo40.7±9.0, n=4; enstatite Fs1.4±0.3Wo4.5±3.2, n=3; magnetite Cr2O3=2.5±0.1 wt%, n=2.

Classification: Carbonaceous chondrite CK3. CK based on the presence of chromium-bearing magnetite and absence of metal and sulfide. Type 3 based on the standard deviation of Fa in olivine and the presence of mesostasis and glass in porphyritic chondrules

Specimens: 22 g on deposit at UNM, Adam Aaronson holds the main mass.

Data from:
  Table 0
  Line 0:
Date:P 2022
Mass (g):174000
Shock stage:low
Weathering grade:low
Fayalite (mol%):18.8±16.9
Ferrosilite (mol%):5.2±5.3, 1.4±0.3
Wollastonite (mol%):40.7±9.0, 4.5±3.2
Classifier:C. Agee, UNM
Type spec mass (g):22
Type spec location:UNM
Main mass:Adam Aaronson
Comments:Fieldname M2302; submitted by C. Agee
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
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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Public domain photographs:
Carl Agee               

     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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