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Northwest Africa 10457
Basic information Name: Northwest Africa 10457
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10457
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 216 g
Meteoritical Bulletin:  MB 104  (2015)  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 15 Dec 2015
Writeup from MB 104:

Northwest Africa 10457 (NWA 10457)

(Northwest Africa)

Purchased: 2013

Classification: Ordinary chondrite (L6)

History: Purchased in 2013 by John Shea. Samples were donated to Cascadia in October, 2014.

Physical characteristics: Reddish weathering patina and patchy fusion crust occur on rough exterior surfaces, and faint chondritic texture is visible in cut faces.

Petrography: Granoblastic textured specimen showing poorly-defined chondrules and feldspar often >50 μm across in a reddish stained section. Chondrule diameter 0.73±0.21 mm (N=8). Contains ~2-3% metal, with <40% of metal and troilite replaced by weathering products. Shock stage S4 (N=25 olivine grains).

Geochemistry: (M. Ream and A. Ruzicka, Cascadia) Olivine (Fa25.9±0.4, N=13), low-Ca pyroxene (Fs21.8±0.3Wo1.4±0.2En76.7±0.4, N=10).

Classification: L6 chondrite based on mineral chemistry and texture.

Specimens: Cascadia holds 43.7 g in multiple 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 2013
Mass (g):216
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):25.9±0.4
Ferrosilite (mol%):21.8±0.3
Wollastonite (mol%):1.4±0.2
Classifier:M. Ream and A. Ruzicka, Cascadia
Type spec mass (g):43.7
Type spec location:Cascadia
Main mass:John Shea
Comments:Lab number CML0814; 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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