Meteoritical Bulletin: Entry for Northwest Africa 6742

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Northwest Africa 6742

Basic information

Name: Northwest Africa 6742
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6742
Observed fall: No
Year found: 2008
Country: (Northwest Africa)
Mass: 149 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	LL3.7
Recommended:			LL3.7 [explanation]

This is 1 of 29 approved meteorites classified as LL3.7. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 10 Mar 2014

Writeup

Writeup from MB 103:

Northwest Africa 6742 (NWA 6742)

(Northwest Africa)

Purchased: 2008 Jun 22

Classification: Ordinary chondrite (LL3.7)

Petrography: (K.Metzler, IfP) Unbrecciated chondrite consisting of about 90 vol% chondrules, 5 vol% interchondrule sulfide/metal and 5 vol% fine-grained interchondrule matrix. It is characterized by a close-fit texture of deformed and indented chondrules. The mean apparent chondrule size is about 1.3 mm. This rock is an example of "cluster chondrites" described in Metzler (2012). Possibly paired with NWA 5205 and NWA 5421.

Geochemistry: Mineral compositions and geochemistry: Measurement of randomly chosen olivine and pyroxene grains revealed Fa_23.1±5.0(4-30); n=72 and Fs_14.7±6.7(3-28); n=50, respectively. Oxygen istotopes (A. Pack, UGött): acid-washed bulk sample analyzed by laser fluorination gave δ¹⁸O=6.36, δ¹⁷O=4.24, Δ¹⁷O=0.90

Bibliography:

Metzler K. (2012) Ultrarapid chondrite formation by hot chondrule accretion? Evidence from unequilibrated ordinary chondrites. Meteorit. Planet. Sci. 47, 2193–2217 (link)

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Ensisheim
Date:	P 2008 Jun 22
Mass (g):	149
Pieces:	1
Class:	LL3.7
Shock stage:	S2
Weathering grade:	W2-3
Fayalite (mol%):	23.1±5.0 (n=72)
Ferrosilite (mol%):	14.7±6.7 (n=50)
Classifier:	K. Metzler
Type spec mass (g):	20
Type spec location:	IfP
Main mass:	A. Knöfel, Germany
Comments:	Submitted by K. Metzler

Plots:

O isotopes:

Institutions
and collections

IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)

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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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Mirko Graul
The Wilcox Collection of Meteorites

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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