Meteoritical Bulletin: Entry for Northwest Africa 8405

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Northwest Africa 8405

Basic information

Name: Northwest Africa 8405
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8405
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 501 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	Angrite
Recommended:			Angrite [explanation]

This is 1 of 51 approved meteorites classified as Angrite. [show all]
Search for other: Achondrites, Angrites

Comments:

Approved 30 Sep 2016

Writeup

help

Writeup from MB 105:

Northwest Africa 8405 (NWA 8405)

(Northwest Africa)

Purchased: 2014 Nov

Classification: Angrite

History: Purchased by Scott Perekslis in November 2014 from a dealer in Erfoud, Morocco.

Physical characteristics: A dark, dense rock (501 g) lacking fusion crust. The fresh interior is mostly khaki-colored with visible black and white grains.

Petrography: (A. Irving and S. Kuehner, UWS) Protogranular texture, mean grainsize 0.6 mm with some oxide grains (pleonaste spinel) up to 5 mm. Composed of olivine, Al-Ti-augite (pink in thin section), anorthite, pleonaste spinel (purple-brown in thin section), Mg-merrillite and troilite (partially altered to iron hydroxides).

Geochemistry: Olivine (Fa_45.0-45.8, FeO/MnO = 65-75, CaO = 1.5-1.6 wt.%, N = 4), Al-Ti-augite (Fs_11.4-11.7Wo_55.4-56.1, FeO/MnO = 58-67, Al₂O₃ = 9.7-10.3 wt.%, TiO₂ = 2.0-2.2 wt.%, N = 3), anorthite (An_99.2-99.3Or_0.1, N = 2).

Classification: Angrite. Paired with NWA 4801.

Specimens: 20.1 g including one polished thin section at UWB; remainder with Mr. S. Perekslis.

Data from:
  MB105
  Table 0
  Line 0:

Place of purchase:	Erfoud
Date:	P 2014 Nov
Mass (g):	501
Pieces:	1
Class:	Angrite
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	45.0-45.8
Ferrosilite (mol%):	11.4-11.7
Wollastonite (mol%):	55.4-56.1
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.1
Type spec location:	UWB
Main mass:	S. Perekslis
Comments:	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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full

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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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