Meteoritical Bulletin: Entry for Northwest Africa 14974

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Northwest Africa 14974

Basic information

Name: Northwest Africa 14974
This is an OFFICIAL meteorite name.
Abbreviation: NWA 14974
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass: 152 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 25 May 2022

Writeup

help

Writeup from MB 111:

Northwest Africa 14974 (NWA 14974)

(Northwest Africa)

Purchased: 2021 Aug

Classification: Carbonaceous chondrite (CK3)

History: Purchased by Jason Whitcomb in August 2021 from an Algerian dealer.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Well-formed chondrules containing Cr-magnetite and devitrified glass (apparent diameter 1220 ± 450 µm, N = 25) and amoeboid, very fine grained CAI are set in a fine grained matrix (~40 vol.%, light to dark brown in thin section) containing Cr-magnetite, intermediate plagioclase and rare sulfide. One examined CAI consists of gehlenite+diopside+intermediate plagioclase with minor gypsum (secondary).

Geochemistry: Olivine (Fa_24.7±11.0, range Fa_6.5-32.8, N = 7), low-Ca pyroxene (Fs_8.1±12.6Wo_2.8±1.6, range Fs_0.7-22.8Wo_1.0-3.8, N = 3), pigeonite (Fs_1.6±0.6Wo_11.2±1.4, range Fs_1.2-2.0Wo_10.2-12.2, N = 2), subcalcic augite (Fs_1.5Wo_28.5; Fs_0.9Wo_34.8, Fs_1.5Wo_38.2; N = 3), augite (Fs_12.2±3.6Wo_48.8±0.5, range Fs_8.1-14.3Wo_48.3-49.2, N = 3), plagioclase (An_18.0Or_5.3; An_27.4Or_3.4; N = 2), magnetite (Cr₂O₃ 3.2-3.6 wt.%, N = 6).

Classification: Carbonaceous chondrite (CK3).

Specimens: 20.5 g including one polished thin section at PSF; remainder with Mr. J. Whitcomb.

Data from:
  MB111
  Table 0
  Line 0:

Place of purchase:	Algeria
Date:	P 2021 Aug
Mass (g):	152
Pieces:	1
Class:	CK3
Shock stage:	S2
Weathering grade:	low
Fayalite (mol%):	24.7±11.0
Ferrosilite (mol%):	8.1±12.6; 12.2±3.6
Wollastonite (mol%):	2.8±1.6; 48.8±0.5
Classifier:	A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):	20.5
Type spec location:	PSF
Main mass:	J. Whitcomb
Comments:	Work name JW-79; submitted by A. Irving

Institutions
and collections

PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 111, in preparation (2022)

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9092 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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