Meteoritical Bulletin: Entry for Northwest Africa 8608

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Northwest Africa 8608

Basic information

Name: Northwest Africa 8608
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8608
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass: 72.2 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	H6
Recommended:			H6 [explanation]

This is 1 of 6686 approved meteorites (plus 5 unapproved names) classified as H6. [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 22 Oct 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8608 (NWA 8608)

(Northwest Africa)

Purchased: 2003 Feb 8

Classification: Ordinary chondrite (H6)

History: A single stone was purchased by Dick Pugh at the Tucson Gem show in 2003 and donated to the Cascadia Meteorite Laboratory.

Physical characteristics: Physical: A faceted individual lacking obvious fusion crust. Abundant fine-grained metal is visible on the smooth medium-gray surface. Low areas filled with yellow brown to red brown sediment. Parallel grooves occur on one side. A prominent fracture occurs perpendicular to the grooves.

Petrography: (M. Hutson and A. Ruzicka, Cascadia) In thin section, the sample is crosscut by numerous parallel to sub-parallel fractures containing aligned metal and sulfide grains and weathering product. The silicates are granular with coarse recrystallized interstitial areas. Approximately 10 relict chondrules (mostly barred olivine) are barely discernable. Olivine grains typically show slight undulose extinction. Large (>100 μm) plagioclase feldspar grains show slight undulose extinction. Sample shows minimal staining with approximately 40% of metal grains replaced by weathering product.

Geochemistry: Compositions of olivine (Fa_19.7±0.4, n=21) and pyroxene (Fs_17.3±0.2Wo_1.4±0.2, n=17) grains are uniform, indicating that the sample is equilibrated.

Classification: H6 chondrite indicated by mineral chemistry and texture.

Specimens: 65.8 g in two pieces and one polished thin section are on deposit at Cascadia.

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Tucson
Date:	P 2003 Feb 8
Mass (g):	72.2
Pieces:	1
Class:	H6
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	19.7±0.4
Ferrosilite (mol%):	17.3±0.2
Wollastonite (mol%):	1.4±0.2
Classifier:	M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):	65.8
Type spec location:	Cascadia
Main mass:	Cascadia
Comments:	Lab number CML0080; submitted by Alex Ruzicka

Institutions
and collections

Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 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 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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