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Northwest Africa 10458
Basic information Name: Northwest Africa 10458
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10458
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 314 g
Meteoritical Bulletin:  MB 104  (2015)  L5
Recommended:  L5    [explanation]

This is 1 of 8963 approved meteorites (plus 5 unapproved names) classified as L5.   [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 10458 (NWA 10458)

(Northwest Africa)

Purchased: Aug 2014

Classification: Ordinary chondrite (L5)

History: Purchased in August 2014 by John Shea from Gary Fujihara who obtained the meteorite from a trader of specimens collected from near the border of Morocco and Algeria. Samples were donated to Cascadia in October, 2014

Physical characteristics: Shiny fusion crust covers most of hand specimen. Rust halos surround metal in cut faces.

Petrography: Granoblastic textured specimen showing somewhat indistinct chondrules and feldspar <50 µm across. Chondrule diameter 0.72±0.37 mm (N=24). Contains ~4% metal, with most metal and troilite grains showing minimal or no replacement by weathering products. Shock stage S3 (N=25 olivine grains).

Geochemistry: (M. Ream and A. Ruzicka, Cascadia) Olivine (Fa25.1±0.4, N=12), low-Ca pyroxene (Fs21.2±0.2Wo1.7±0.2En77.1±0.3, N=12).

Classification: L5 chondrite based on mineral chemistry and texture.

Specimens: Cascadia holds 42.3 g in three pieces, in addition to one polished thin section and a mounted butt. John H. Shea holds the main mass.

Data from:
  Table 0
  Line 0:
Date:P Aug 2014
Mass (g):314.3
Shock stage:S3
Weathering grade:W1
Fayalite (mol%):25.1±0.4
Ferrosilite (mol%):21.2±0.2
Wollastonite (mol%):1.7±0.2
Classifier:M. Ream and A. Ruzicka, Cascadia
Type spec mass (g):42.3
Type spec location:Cascadia
Main mass:John Shea
Comments:Lab number CML0815; 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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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
John A. Shea      

     This is 1 of 9825 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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