Meteoritical Bulletin: Entry for Northwest Africa 8626

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Northwest Africa 8626

Basic information

Name: Northwest Africa 8626
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8626
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 151 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	Eucrite-an
Recommended:			Eucrite-an [explanation]

This is 1 of 15 approved meteorites classified as Eucrite-an. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 29 Nov 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8626 (NWA 8626)

(Northwest Africa)

Purchased: 2014 May 6

Classification: HED achondrite (Eucrite, anomalous)

History: Purchased in Rissani May 6, 2014.

Physical characteristics: A single stone with a dull fusion crust. Cut surface reveals a light gray fine-grained interior with coarser mm-sized clasts.

Petrography: Brecciated igneous rock with ophitic to subophitic texture. Main minerals are zoned pyroxene and plagioclase. Typical grain size is 200 μm in the finer host lithology and up to mm sized in the coarser lithology. Accessory metal, chromite, ilmenite, silica. Metal is unusually abundant for a eucrite, in agreement with the high magnetic susceptibility. About 40% of the metal is replaced by weathering products. Saturation magnetization of a 380 mg sample indicates a bulk metal content of 2.1 wt% (about 0.75 vol%).

Geochemistry: Pyroxene Fs_50.0±7.1Wo_15.9±6.9(Fs_36.7-60.6Wo_8.9-25.3, FeO/MnO=30.5±2.8, N=9). Plagioclase An_80.9±1.7Or_1.4±0.4(N=4). Magnetic susceptibility log χ = 3.95 (χ in 10^-9 m³/kg) indicate a metal content an order of magnitude above the usual eucrite (log χ =2.95±0.30, N=70 in Rochette et al., 2009) almost to the level of Pomozdino.

Classification: Metal-rich eucrite (basaltic, brecciated)

Specimens: 21 g and a polished section in CEREGE. Main mass with P. Thomas

Bibliography:

Rochette P., Gattacceca J., Bourot-Denise M., Consolmagno G., Folco L., Kohout T., Pesonen L. and Sagnotti L. (2009) Magnetic classification of stony meteorites: 3. Achondrites. Meteorit. Planet. Sci. 44 405-427. (link)

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Rissani (Morocco)
Date:	P 2014 May 6
Mass (g):	151
Pieces:	1
Class:	Eucrite-an
Weathering grade:	moderate
Ferrosilite (mol%):	50.0±7.1 (30.7-60.6, N=9)
Wollastonite (mol%):	15.9±6.9 (8.9-25.3, N=9)
Magnetic suscept.:	3.95
Classifier:	J. Gattacceca, CEREGE
Type spec mass (g):	21
Type spec location:	CEREGE
Main mass:	P. Thomas
Comments:	Submitted by J. Gattacceca

Institutions
and collections

CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 10 Jun 2023)

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)

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Revision
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