Meteoritical Bulletin: Entry for Northwest Africa 15786

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Northwest Africa 15786

Basic information

Name: Northwest Africa 15786
This is an OFFICIAL meteorite name.
Abbreviation: NWA 15786
Observed fall: No
Year found: 2023
Country: Mali
Mass: 502 g

Classification
history:

Recommended:

CK3 [explanation]

This is 1 of 79 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 15786 (NWA 15786)

Mali

Purchased: 2023 Jan

Classification: Carbonaceous chondrite (CK3)

History: Found in Mali and purchased by Preston Allen in January 2023 from a dealer in Warren, Ohio, who had acquired the stone from a Saharawi source.

Petrography: A. Irving, UWS, and J. Boesenberg, BrownU) Separated well-formed, magnetite-bearing, unequilibrated chondrules (apparent diameter 1030±360 µm, N = 23) are set in a relatively fine grained matrix (~40 vol.%) containing stained Cr-magnetite, intermediate plagioclase (andesine to labradorite), troilite, pentlandite, chlorapatite and minor secondary calcite. Several extensively recrystallized, very fine grained CAI containing diopside and plagioclase are present in the studied thin section.

Geochemistry: Forsterite core (Fa_0.6), olivine (Fa_30.7±2.6, PMD 5.1%, range Fa_24.4-32.2, N = 8), low-Ca pyroxene (Fs_24.2±2.0Wo_0.7±0.1, range Fs_21.1-25.5Wo_0.6-0.8, N = 4), subcalcic augite (Fs_5.8±4.3Wo_36.6±2.5, range Fs_1.5-10.05Wo_39.5-35.1, N = 3), augite (Fs_11.2±1.8Wo_49.1±0.8, range Fs_8.3-13.7Wo_47.3-49.7, N = 7), Al-diopside (Fs_3.3Wo_51.1, Al₂O₃ 7.0 wt.%), plagioclase (An_23.6-52.9Or_3.3-1.0, N = 5), magnetite (Cr₂O₃ 2.9-3.9 wt.%, N = 8).

Classification: Carbonaceous chondrite (CK3).

Specimens: 51.4 g including one polished thin section at UWB; remainder with Mr. P. Allen.

Data from:
  MB112
  Table 0
  Line 0:

Place of purchase:	Warren, OH
Date:	P 2023 Jan
Mass (g):	502
Pieces:	1
Class:	CK3
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	0.6; 30.7±2.6
Ferrosilite (mol%):	24.2±2.0; 11.2±1.8
Wollastonite (mol%):	0.7±0.1; 49.1±0.8
Classifier:	A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):	51.4
Type spec location:	UWB
Main mass:	P. Allen
Comments:	Work name SK22-5; submitted by A. Irving

Institutions
and collections

UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)

Catalogs:

References:

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

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Geography:

Mali

Mali

Coordinates:

Unknown.

Statistics:
This is 1 of 90 approved meteorites from Mali (plus 2 unapproved names)

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