Meteoritical Bulletin: Entry for Northwest Africa 11229

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Northwest Africa 11229

Basic information

Name: Northwest Africa 11229
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11229
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 514 g

Classification
history:

Meteoritical Bulletin:	MB 106	(2018)	L6
Recommended:			L6 [explanation]

This is 1 of 12331 approved meteorites (plus 8 unapproved names) classified as L6. [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 21 Apr 2017

Writeup

help

Writeup from MB 106:

Northwest Africa 11229 (NWA 11229)

(Northwest Africa)

Purchased: 2014 Apr

Classification: Ordinary chondrite (L6)

History: A NWA specimen was donated to Cascadia by Dick Pugh, who purchased it from Patrick Thompson/ET Meteorites in April 2014.

Physical characteristics: A single, faceted and regmaglypted individual has brownish-black exterior with partially weathered fusion crust. Cut surfaces reveal chondritic texture with prominent shock veins.

Petrography: In thin section granoblastic texture predominant and chondrules are barely recognizable, consistent with type 6. Contains ~5-6% metal and ~3-4% troilite (visual estimates). Shock stage S4 (conventional), S3.8±0.9 (weighted), with abundant maskelynite and a prominent, branching shock melt vein over 1 mm wide in places.

Geochemistry: Olivine Fa_26.2±0.8(N=26); low-Ca pyroxene Fs_22.3±1.7Wo_1.6±0.5(N=24); high-Ca pyroxene Fs_8.0±1.6Wo_45.7±2.0(N=15); maskelynite Ab_80.6±1.4Or_7.6±1.5(N=17)

Classification: L6 chondrite based on texture, metal content and composition of olivine and low-Ca pyroxene.

Specimens: Cascadia holds the entire sample (type specimen), which consists of ~499 g in 6 pieces, one potted butt, and 1 thin section.

Data from:
  MB106
  Table 0
  Line 0:

Place of purchase:	Portland, Oregon
Date:	P 2014 Apr
Mass (g):	513.8
Pieces:	1
Class:	L6
Shock stage:	S4
Weathering grade:	W1
Fayalite (mol%):	26.2±0.8
Ferrosilite (mol%):	22.3±1.7
Wollastonite (mol%):	1.6±0.5
Classifier:	M. Soiseth and A. Ruzicka, Cascadia
Type spec mass (g):	498.7
Type spec location:	Cascadia
Main mass:	Cascadia
Comments:	Lab number CML0804; 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)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)

Catalogs:

References:

Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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