Meteoritical Bulletin: Entry for Northwest Africa 8291

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Northwest Africa 8291

Basic information

Name: Northwest Africa 8291
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8291
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 296 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	Mesosiderite
Recommended:			Mesosiderite [explanation]

This is 1 of 273 approved meteorites classified as Mesosiderite. [show all]
Search for other: Mesosiderites, Metal-rich meteorites

Comments:

Approved 14 Mar 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8291 (NWA 8291)

(Northwest Africa)

Purchased: 2013

Classification: Mesosiderite

History: Purchased by Brahim Tahiri from a Moroccan meteorite hunter and sent to his partner Sean Tutorow for classification, 2013.

Physical characteristics: 45 small stones that are visually identical, irregular dark exterior with some iron staining, saw cut reveals mm-sized, bright metal grains set in dark brown silicate matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows approximately 70% silicate minerals and 30% metal. Silicate mineralogy ~70% pyroxene, ~25% plagioclase, accessory silica and olivine. Silicate grain sizes up to 300 μm. Metal: ~90% kamacite, ~10% taenite, 5-10% of total metal is oxidized. Metal domains up to 3 mm. Many metal/oxide veinlets and blebs throughout.

Geochemistry: (C. Agee and H. Miley, UNM) EMPA. Low Ca-pyroxene Fs_32.4±7.0Wo_2.7±0.7, Fe/Mn=28±2 n=9, olivine Fa_31.7.7, Fe/Mn=43, n=1, plagioclase Or_0.5±0.1Ab_9.0±1.5An_90.5±1.6, n=7.

Classification: Mesosiderite

Specimens: 20.95 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2013
Mass (g):	295.7
Pieces:	45
Class:	Mesosiderite
Classifier:	C. Agee, UNM
Type spec mass (g):	20.95
Type spec location:	UNM
Main mass:	Sean Tutorow
Comments:	Field name G509; submitted by C. Agee, UNM

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

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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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