Meteoritical Bulletin: Entry for Northwest Africa 15362

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Northwest Africa 15362

Basic information

Name: Northwest Africa 15362
This is an OFFICIAL meteorite name.
Abbreviation: NWA 15362
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass: 69.6 g

Classification
history:

Recommended:

Achondrite-prim-ung [explanation]

This is 1 of 4 approved meteorites classified as Achondrite-prim-ung. [show all]
Search for other: Primitive achondrites, Ungrouped achondrites

Comments:

Approved 25 Dec 2022

Writeup

help

Writeup from MB 111:

Northwest Africa 15362 (NWA 15362)

(Northwest Africa)

Purchased: 2022 Apr

Classification: Prim. achondrite-ungr

History: Purchased by Ziyao Wang in April 2022 from a Mauritanian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Protogranular aggregate of enstatite (as larger oikocrysts), forsterite (as enclosed chadacrysts and separate larger grains), diopside and sodic plagioclase with accessory stained kamacite, schreibersite, daubreelite and Cr-bearing troilite. Orthopyroxene grains exhibit polysynthetic twinning and are preferentially stained by secondary Fe oxides, whereas olivine grains are not so stained.

Geochemistry: Forsterite (Fa_1.1-1.2, FeO/MnO = 3-4, N = 6), enstatite (Fs_1.2-1.5Wo_0.8-0.9, FeO/MnO = 2-3, N = 5), diopside (Fs_0.6-0.7Wo_42.3-43.3, FeO/MnO = 1-2, N = 5), plagioclase (Ab_61.0-68.0An_38.7-31.7Or_0.2-0.3; Ab_84.7An_14.4Or_0.9; N = 5). Oxygen isotopes (D. Ibarra, BrownU): analyses of acid-washed subsamples by laser fluorination gave, respectively δ¹⁷O 1.161, 1.356; δ¹⁸O 4.914, 5.255; Δ¹⁷O -1.430, -1.415 per mil (TFL slope value = 0.526). All data were normalized to San Carlos olivine analyzed concurrently, per the recommendations of Sharp and Wostbrock (2021).

Classification: Primitive achondrite (ungrouped). Oxygen isotopes plot to more negative Δ¹⁷O values than for winonaites or acapulcoites

Specimens: 30.3 g including one polished thin section at UWB; remainder with WangZ.

Data from:
  MB111
  Table 0
  Line 0:

Place of purchase:	Mauritania
Date:	P 2022 Apr
Mass (g):	69.6
Pieces:	1
Class:	Prim. achondrite-ungr
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	1.1-1.2
Ferrosilite (mol%):	1.2-1.5; 0.6-0.7
Wollastonite (mol%):	0.8-0.9; 42.3-43.3
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	30.3
Type spec location:	UWB
Main mass:	WangZ
Comments:	Work name WZY-115; submitted by A. Irving

Plots:

O isotopes:

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)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
BrownU: Joseph Boesenberg Brown University Dept of Earth, Environmental and Planetary Sciences (DEEPS) 324 Brook Street Providence, RI 02912 , United States (institutional address; updated 26 Oct 2023)
WangZ: Ziyao Wang, Hebei GEO University North Campus, Huai An dong road 127, Shijiazhuang, Hebei Province , China (private address; updated 25 Jun 2021)

Catalogs:

References:

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

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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