Meteoritical Bulletin: Entry for Northwest Africa 8789

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Northwest Africa 8789

Basic information

Name: Northwest Africa 8789
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8789
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 75 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	EH3
Recommended:			EH3 [explanation]

This is 1 of 142 approved meteorites classified as EH3. [show all]
Search for other: EH chondrites, Enstatite chondrites, Enstatite chondrites (type 3), and Enstatite-rich meteorites

Comments:

Approved 19 Apr 2016

Writeup

help

Writeup from MB 105:

Northwest Africa 8789 (NWA 8789)

(Northwest Africa)

Purchased: 2014 Jan

Classification: Enstatite chondrite (EH3)

History: Purchased by Fabien Kuntz in January 2014 from a dealer in Rissani, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Small, well-formed chondrules are set in a red-brown matrix (~30 vol.%). Minerals are orthopyroxene, silica polymorph (with enstatite in chondrules), albite, intermediate plagioclase, altered kamacite, suessite, schreibersite, troilite, gypsum (as "mothy" grains, probably after primary oldhamite) and rare forsterite. No CAI were found.

Geochemistry: Olivine (Fa_0.2, N =1), orthopyroxene (Fs_0.2-15.2Wo_0.0-1.5, N = 18), metal (Si 3.1 wt.%, Ni 2.7 wt.%, Co 0.5 wt.%, N = 2), suessite (Ni 80.7 wt.%, Si 14.8 wt.%, Fe 4.1 wt.%, Co <0.1 wt.%).

Classification: Enstatite chondrite (EH3). The relatively high proportion of matrix and presence of accessory suessite are anomalous features.

Specimens: 17.52 g including one polished thin section at PSF; main mass with Kuntz.

Data from:
  MB105
  Table 0
  Line 0:

Place of purchase:	Rissani
Date:	P 2014 Jan
Mass (g):	75
Pieces:	1
Class:	EH3
Shock stage:	S2
Weathering grade:	moderate
Fayalite (mol%):	0.2
Ferrosilite (mol%):	0.2-15.2 (N = 18)
Wollastonite (mol%):	0.0-1.5
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	17.52
Type spec location:	PSF
Main mass:	F. Kuntz
Comments:	K222; submitted by P. Sipiera

Institutions
and collections

PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Kuntz: Fabien Kuntz, France; Website (private address)

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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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Don Cuarzo

Geography:

Coordinates:

Unknown.

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

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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