Meteoritical Bulletin: Entry for Northwest Africa 12628

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Northwest Africa 12628

Basic information

Name: Northwest Africa 12628
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12628
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 73.5 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Achondrite-ung
Recommended:			Achondrite-ung [explanation]

This is 1 of 131 approved meteorites classified as Achondrite-ung. [show all]
Search for other: Achondrites, Ungrouped achondrites

Comments:

Approved 20 Oct 2019

Writeup

help

Writeup from MB 108:

Northwest Africa 12628 (NWA 12628)

(Northwest Africa)

Purchased: 2019 Mar

Classification: Ungrouped achondrite

History: Purchased in March 2019 by Ke Zuokai from Moroccan dealer Habib Naji.

Physical characteristics: A single fusion-crusted, beige-colored stone (73.5 g) found as seven broken fragments.

Petrography: (A. Irving and S. Kuehner, UWS) Intersertal igneous texture. Composed predominantly of patchily zoned clinopyroxene (pigeonite and subcalcic augite) and sodic plagioclase with accessory fayalitic olivine, silica polymorph, ilmenite, Ti-chromite, troilite, Ni-free metal (no Ni detected in the EDS spectra), and rare phosphates (merrillite and chlorapatite). Several thin shock melt veinlets are present.

Geochemistry: Pigeonite (Fs_24.8-28.2Wo_5.5-6.2, FeO/MnO=33-36, N=3), subcalcic augite (Fs_23.2Wo_25.6; Fs_26.5Wo_34.6; FeO/MnO=33-38; N = 2), fayalite (Fa_84.9-85.3, FeO/MnO=59-64, N=2), plagioclase (Ab_78.1-80.4An_18.1-20.7Or_1.2-1.5, N = 2). Oxygen isotopes (K. Ziegler, UNM): analysis of acid-washed subsamples by laser fluorination gave, respectively, δ¹⁷O 4.075, 4.298, 4.089; δ¹⁸O 5.427, 5.954, 5.452; Δ¹⁷O 1.210, 1.154, 1.210 per mil.

Classification: Ungrouped igneous achondrite with isotopic affinities to LL chondrites.

Specimens: 15.0 g including one polished thin section at UWB; remainder with Mr. K. Zuokai.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2019 Mar
Mass (g):	73.5
Pieces:	7
Class:	Achondrite-ung
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	84.9-85.3
Ferrosilite (mol%):	24.8-28.2;23.2-26.5
Wollastonite (mol%):	5.5-6.2; 25.6-34.6
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	15.0
Type spec location:	UWB
Main mass:	K. Zuokai
Comments:	Work name HN 815; submitted by A. Irving

Plots:

O isotopes:

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)
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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

Find references in NASA ADS:
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Photos:

Credit	Photos
Public domain photographs:
A. Irving

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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