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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:help 165 g
Meteoritical Bulletin:  MB 106  (2018)  L6
Recommended:  L6    [explanation]

This is 1 of 12920 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 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 Fa26.2±0.5 (N=19), low-Ca pyroxene Fs22.1±1.4Wo1.7±0.4 (N=14), high-Ca pyroxene Fs10.2±2.0Wo46.6±1.4 (N=16), maskelynite Ab81.8±0.9Or7.9±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:
  Table 0
  Line 0:
Date:P 2005
Mass (g):165
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
   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)
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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     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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