Meteoritical Bulletin: Entry for Northwest Africa 8693

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Northwest Africa 8693

Basic information

Name: Northwest Africa 8693
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8693
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass: 833 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	LL3.6/3.7
Recommended:			LL3.6/3.7 [explanation]

This is the only approved meteorite classified as LL3.6/3.7.
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 24 Dec 2014

Writeup

Writeup from MB 103:

Northwest Africa 8693 (NWA 8693)

(Northwest Africa)

Purchased: Feb 2010

Classification: LL3.6/3.7

Petrography: The sample is an LL3 chondrite, probably LL3.6/3.7. Ferroan olivine grains have a mean Cr₂O₃ content of 0.07±0.04 wt.%, indicating that the petrologic type is higher than type 3.2. The absence of glass in the chondrules means that it is higher than type 3.5. The heterogeneous nature of the olivine and low-Ca pyroxene indicates that it is less equilibrated than type 3.8 (for example, Dhajala). Chondrules are large, typically 400 - 1500 μm in diameter, indicative of LL chondrites. Kamacite: The mean kamacite Co value is 2.3±0.2 wt.% (n=14). This is in the LL range and is far from the H or L ranges. The low-Ca pyroxene grains exhibit polycrystalline twinning. The shock stage is S4; the rock exhibits weak mosaicism. Weathering is W1; most metal grains lack oxide rims.

Geochemistry: Fa_16.8±7.7, n=30; Fs_8.2±7.6Wo_0.6±0.7, n=15.

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Moussa Minerals and Fossils, U.K.
Date:	P Feb 2010
Mass (g):	833.1
Pieces:	1
Class:	LL3.6/3.7
Shock stage:	S4
Weathering grade:	W1
Fayalite (mol%):	16.8±7.7
Ferrosilite (mol%):	8.2±7.6
Wollastonite (mol%):	0.6±0.7
Classifier:	A. Rubin and J. Breen, UCLA
Type spec mass (g):	195.52
Type spec location:	UCLA
Main mass:	Russell Reynolds; remaining mass is 625.4 g.
Comments:	UCLA temporary inventory number 1931; submitted by Alan Rubin

Institutions
and collections

UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)

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 7688 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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