Meteoritical Bulletin: Entry for Northwest Africa 15774

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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: 174 kg

Classification
history:

Meteoritical Bulletin:	MB 112	(2023)	CK3
Recommended:			CK3 [explanation]

This is 1 of 86 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

help

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 Fa_18.8±16.9, Fe/Mn=103±51, Cr₂O₃= 0.09±0.09 (wt%), n=10; diopside Fs_5.2±5.3Wo_40.7±9.0, n=4; enstatite Fs_1.4±0.3Wo_4.5±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:
  MB112
  Table 0
  Line 0:

Date:	P 2022
Mass (g):	174000
Pieces:	1
Class:	CK3
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

Institutions
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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 112, in preparation (2023)

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Photos:

Credit	Photos
Public domain photographs:
Carl Agee

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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