Meteoritical Bulletin: Entry for Northwest Africa 13304

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Northwest Africa 13304

Basic information

Name: Northwest Africa 13304
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13304
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 263 g

Classification
history:

Recommended:

Aubrite [explanation]

This is 1 of 78 approved meteorites classified as Aubrite. [show all]
Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites

Comments:

Approved 23 May 2020

Writeup

help

Writeup from MB 109:

Northwest Africa 13304 (NWA 13304)

Northwest Africa

Purchased: 2019

Classification: Enstatite achondrite (Aubrite)

History: Two fragments of ~23 g purchased by Dustin Dickens October of 2019 in Morocco from Mohamed Amouri. Dustin later received an additional ~24 0g stone from Hammi in February of 2020 at the Tucson gem and mineral show.

Physical characteristics: Exterior has dark colored fusion crust patches. Saw cuts and broken surfaces reveal a breccia of fragmented white pyroxene grains, some up to several mm in size, set in a fine-grained matrix. Scattered brown-orange colored, oxidized metal grains are visible throughout.

Petrography: (C. Agee, UNM) This meteorite consists primarily of larger fragmental enstatite and diopside grains nested in a fine-grained, cataclastic matrix of enstatite and diopside. Kamacite, troilite, alabandite, and daubreelite were detected. Olivine and plagioclase were not detected.

Geochemistry: (C. Agee, UNM) Enstatite Fa_0.1±0.1Wo_1.3±0.3, n=5; diopside Fs_0.0±0.0Wo_42.1±4.7, n=2. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave δ¹⁸O= 5.511, 5.608, 5.742; δ¹⁷O= 2.868, 2.924, 3.004; Δ¹⁷O= -0.042, -0.037, -0.028 (linearized, all per mil, TFL slope=0.528).

Classification: Aubrite

Specimens: 20.1 g including a probe mount on deposit at UNM, Dustin Dickens holds the main mass.

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2019
Mass (g):	263
Pieces:	3
Class:	Aubrite
Shock stage:	moderate
Weathering grade:	low
Ferrosilite (mol%):	0.1±0.1, 0.0±0.0
Wollastonite (mol%):	1.3±0.3, 42.1±4.7
Classifier:	C. Agee, UNM
Type spec mass (g):	20.1
Type spec location:	UNM
Main mass:	Dustin Dickens
Comments:	Field name DD-61; submitted by C. Agee, UNM

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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 109, in preparation (2020)

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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