Meteoritical Bulletin: Entry for Northwest Africa 10458

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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: 314 g

Classification
history:

Meteoritical Bulletin:	MB 104	(2015)	L5
Recommended:			L5 [explanation]

This is 1 of 8831 approved meteorites (plus 4 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

help

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 (Fa_25.1±0.4, N=12), low-Ca pyroxene (Fs_21.2±0.2Wo_1.7±0.2En_77.1±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:
  MB104
  Table 0
  Line 0:

Date:	P Aug 2014
Mass (g):	314.3
Pieces:	1
Class:	L5
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

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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
John A. Shea

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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