Meteoritical Bulletin: Entry for Northwest Africa 8404

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Northwest Africa 8404

Basic information

Name: Northwest Africa 8404
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8404
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 28 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	Diogenite-olivine
Recommended:			Diogenite-olivine [explanation]

This is 1 of 24 approved meteorites classified as Diogenite-olivine. [show all]
Search for other: Achondrites, Diogenites, and HED achondrites

Comments:

Approved 29 May 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8404 (NWA 8404)

(Northwest Africa)

Purchased: 2014

Classification: HED achondrite (Diogenite, olivine)

History: Purchased by J. Wooddell from a Moroccan dealer, 2014 Feb 7, at the Tucson Gem and Mineral Show.

Physical characteristics: Single stone fragment with dull moderately weathered black fusion crust covering 35% of the stone. Broken surface and saw cut reveal numerous mm-sized green crystals set in light yellow groundmass.

Petrography: Microprobe examination of a polished mount shows a brecciated texture with large pyroxene grains 300-2000 μm and smaller olivine grains 100-500 μm, many grains are fragmental to cataclastic. Accessory plagioclase, iron metal, and troilite. Minor amounts of iron oxidation.

Geochemistry: (C. Agee and N. Muttik, UNM) EMPA. Low Ca-pyroxene Fs_25.0±0.3Wo_3.3±0.3, Fe/Mn=30±1, n=13; olivine Fa_26.8±0.3, Fe/Mn=49±3, n=9; plagioclase An_88.2±3.0Ab_11.4±2.9Or_0.4±0.2, n=4. (Karen Ziegler, UNM) Oxygen isotope values of 3 acid-washed aliquots of bulk sample, 1.0, 1.7, 1.8 mg, gave δ¹⁷O = 1.510, 1.328, 1.452, δ¹⁸O = 3.477, 3.103, 3.233, Δ¹⁷O = -0.326, -0.310, -0.255 (linearized, all permil).

Classification: Achondrite (Diogenite-olivine) based on the presence of approximately 25% olivine. Typical δ¹⁸O values for diogenites, however two analyses gave anomalously low values for Δ¹⁷O.

Specimens: 16.1 g plus a thin section on deposit at UNM, J. Wooddell holds the remainder and a mount.

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Tucson
Date:	P 2014
Mass (g):	28
Pieces:	1
Class:	Diogenite-olivine
Weathering grade:	low
Classifier:	C. Agee, UNM
Type spec mass (g):	16.1
Type spec location:	UNM
Main mass:	J. Wooddell
Comments:	Field name JW-30; 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. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full

Find references in NASA ADS:
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Photos:

Credit	Photos
Public domain photographs:
Jim Wooddell

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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