Meteoritical Bulletin: Entry for Northwest Africa 15634

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Northwest Africa 15634

Basic information

Name: Northwest Africa 15634
This is an OFFICIAL meteorite name.
Abbreviation: NWA 15634
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass: 101 g

Classification
history:

Recommended:

CV3 [explanation]

This is 1 of 605 approved meteorites (plus 1 unapproved name) classified as CV3. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites

Comments:

Approved 23 Feb 2023

Writeup

help

Writeup from MB 112:

Northwest Africa 15634 (NWA 15634)

(Northwest Africa)

Purchased: 2022 Jun

Classification: Carbonaceous chondrite (CV3)

History: Purchased by Shun-Chung Yang in June 2022 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Relatively large well-formed, unequilibrated chondrules (some with multiple rims, apparent diameter 1030 ± 550 µm, N = 25) and large fine-grained CAI are set in a fine grained matrix (~40 vol.%, orange-brown in thin section) containing Cr magnetite, augite, intermediate plagioclase (and some glass of similar composition), rare troilite and minor secondary barite. Mineral phases identified in CAI include gehlenite, anorthite, diopside, spinel, hedenbergite and sodalite.

Geochemistry: Olivine (Fa_15.8±15.3, range Fa_0.3-38.7, N = 20), low-Ca pyroxene (Fs_2.8±1.2Wo_0.9±0.1, range Fs_1.3-3.8Wo_0.8-1.0, N = 4), subcalcic augite (Fs_2.1±0.5Wo_36.4±2.1, range Fs_1.8-2.5Wo_37.9-35.0, N = 2), augite (Fs_5.6±6.9Wo_46.0±1.9, range Fs_0.4-15.6Wo_43.8-48.0, N = 5), plagioclase (Ab_83.9-92.2An_15.3-6.0Or_0.9-1.8, N = 2), magnetite (Cr₂O₃ 1.4-2.9 wt.%, N = 7). Mineral phases in CAI: diopside (Fs_1.5Wo_48.0, Al₂O₃ 1.3 wt.%), anorthite (An_98.9Or_0.0).

Classification: Carbonaceous chondrite (CVox3).

Specimens: 20.3 g including one polished thin section at UWB; remainder with Mr. S.-C. Yang.

Data from:
  MB112
  Table 0
  Line 0:

Place of purchase:	Erfoud
Date:	P 2022 Jun
Mass (g):	101
Pieces:	1
Class:	CV3
Shock stage:	S2
Weathering grade:	low
Fayalite (mol%):	15.8±15.3
Ferrosilite (mol%):	2.8±1.2
Wollastonite (mol%):	0.9±0.1
Classifier:	A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):	20.3
Type spec location:	UWB
Main mass:	S.-C. Yang
Comments:	Work name SCY-78; 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:

Coordinates:

Unknown.

Statistics:
This is 1 of 9042 approved meteorites from (Northwest Africa) (plus 1870 unapproved names)

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