Meteoritical Bulletin: Entry for Northwest Africa 11230

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Northwest Africa 11230

Basic information

Name: Northwest Africa 11230
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11230
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass: 165 g

Classification
history:

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

This is 1 of 13099 approved meteorites (plus 11 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 11230 (NWA 11230)

(Northwest Africa)

Purchased: 2005

Classification: Ordinary chondrite (L6)

History: Two thick slices donated to Cascadia by Pete Zemeckas who purchased an unclassified NWA from Dean Bessey circa 2005.

Physical characteristics: Greyish brown individual contains patches of caliche on exterior surfaces. Prominent dark shock veins visible in cut faces.

Petrography: In thin section granoblastic texture with mostly indistinct chondrules visible, consistent with type 6. Most metal and some troilite weathered consistent with weathering grade W3, weathering product constitutes ~5-7% of rock (visual estimate). Shock stage S4 (conventional), S4.2±0.5 (weighted), with abundant maskelynite and a branching shock vein over 1 mm wide in places.

Geochemistry: Olivine Fa_26.2±0.5(N=19), low-Ca pyroxene Fs_22.1±1.4Wo_1.7±0.4(N=14), high-Ca pyroxene Fs_10.2±2.0Wo_46.6±1.4(N=16), maskelynite Ab_81.8±0.9Or_7.9±0.8(N=17).

Classification: L6 chondrite based on texture, amount of weathering product derived from metal, olivine and pyroxene composition.

Specimens: Cascadia holds the type specimen which consists of 39.5 g, a polished thin section, and a mounted stub.

Data from:
  MB106
  Table 0
  Line 0:

Date:	P 2005
Mass (g):	165
Pieces:	1
Class:	L6
Shock stage:	S4
Weathering grade:	W3
Fayalite (mol%):	26.2±0.5
Ferrosilite (mol%):	22.1±1.4
Wollastonite (mol%):	1.7±0.4
Classifier:	A. Seufert and A. Ruzicka, Cascadia
Type spec mass (g):	39.5
Type spec location:	Cascadia
Main mass:	Pete Zemeckas, 2088 Thornlea Drive, Oakville, Ontario, Canada L6L 1 K6.
Comments:	Lab number CML0848; 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)
Bessey: Dean Bessey ,P.O. Box 40810, Glenfield, Auckland 1310 , New Zealand; Website (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.

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Geography:

Coordinates:

Unknown.

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

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