Meteoritical Bulletin: Entry for Northwest Africa 7676

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Northwest Africa 7676

Basic information

Name: Northwest Africa 7676
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7676
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass: 1050 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	LL3
Recommended:			LL3 [explanation]

This is 1 of 452 approved meteorites classified as LL3. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 8 Nov 2014

Writeup

Writeup from MB 103:

Northwest Africa 7676 (NWA 7676)

(Northwest Africa)

Purchased: 2012 Feb

Classification: Ordinary chondrite (LL3)

History: Purchased by E. Twelker in February 2012 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Relatively fresh specimen composed of closely packed, well-formed chondrules (0.3-2.7 mm, mean 1.8 mm in diameter) with a relatively low content of metal (some fresh and some partially altered). Olivine, orthopyroxene, clinopyroxene, sodic plagioclase, chromite, altered kamacite and troilite.

Geochemistry: Olivine (Fa_0.2-89.6; Cr₂O₃ in ferroan olivine 0.02-0.11 wt.%, mean 0.05 wt.%, s.d. 0.03 wt.%, N = 9), orthopyroxene (Fs_2.4-22.1Wo_0.3-0.9, N = 3), clinopyroxene (Fs_3.9-8.9Wo_40.7-45.2).

Classification: Ordinary chondrite (LL3).

Specimens: A total of 30.8 g of material and one polished thin section are on deposit at UWB. Twelker holds the main mass.

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Tucson
Date:	P 2012 Feb
Mass (g):	1050
Pieces:	several
Class:	LL3
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	0.2-89.6
Ferrosilite (mol%):	2.4-22.1
Wollastonite (mol%):	0.3-0.9
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	30.8
Type spec location:	UWB
Main mass:	E. Twelker
Comments:	ET13-1; 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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Twelker: Eric Twelker, P.O. Box 844, Port Townsend, WA 98368, United States; Website (private address; updated 1 Dec 2014)

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:
Find references in Google Scholar:

Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Mason Griffin
Ryan Upchurch

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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