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Northwest Africa 10454
Basic information Name: Northwest Africa 10454
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10454
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass:help 242 g
Meteoritical Bulletin:  MB 104  (2015)  L5/6
Recommended:  L5/6    [explanation]

This is 1 of 192 approved meteorites classified as L5/6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 15 Dec 2015
Writeup from MB 104:

Northwest Africa 10454 (NWA 10454)

(Northwest Africa)

Purchased: Feb 2004

Classification: Ordinary chondrite (L5/6)

History: Purchased by Dick Pugh from a Moroccan trader during the February 2004 Gem and Mineral Show in Tucson, Arizona. Pieces were donated to Cascadia in 2004 and the remaining mass in 2014.

Physical characteristics: Fragmented hand specimen partly covered with a thin fusion crust and partly covered by caliche. Cut and polished face reveals lighter-colored granoblastic clasts cut by veins, set in a larger portion of darker host that includes chondrules and fragments and small patches of apparent dark-gray shock melt.

Petrography: Host consists of numerous, readily delineated chondrules (0.71±0.35 mm diameter) set against a translucent to transparent matrix. Somewhat coarse feldspar (length 51±23 μm, range 23-123 μm, N=43) within and around chondrules. Rust stains occur around metal (~6% overall in rock), but metal is largely unaffected by weathering.

Geochemistry: (K. Farley and A. Ruzicka, Cascadia) Olivine (Fa25.9±0.8, Fe/Mn = 49.0±4.5 at., N = 27), low-Ca pyroxene (Fs21.7±0.3Wo1.9±0.1En76.5±0.3, Fe/Mn = 29.0±2.3 at., N = 23), feldspar (Ab83.8±1.0An11.5±1.1Or4.7±1.1, N = 6).

Classification: L5/6 based on mineral chemistry, metal content, chondrule size, and textures. Feldspar grain size consistent with type 5/6 transition.

Specimens: Cascadia holds the entire sample which includes two specimens of mass 214.9 g and 22.5 g, as well as one polished thin section and one potted butt.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P Feb 2004
Mass (g):242
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):25.9±0.8
Ferrosilite (mol%):21.7±0.3
Wollastonite (mol%):1.9±0.1
Classifier:K. Farley and A. Ruzicka, Cascadia
Type spec mass (g):237.4
Type spec location:Cascadia
Main mass:Cascadia
Comments:Lab number CML0139; submitted by A. 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)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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