Meteoritical Bulletin: Entry for Northwest Africa 10885

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Northwest Africa 10885

Basic information

Name: Northwest Africa 10885
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10885
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 213 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	L6
Recommended:			L6 [explanation]

This is 1 of 12780 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 Oct 2016

Writeup

help

Writeup from MB 105:

Northwest Africa 10885 (NWA 10885)

(Northwest Africa)

Purchased: 3 May 2013

Classification: Ordinary chondrite (L6)

History: Purchased on eBay from Adam Bates/BC Meteorites on May 3, 2013. Seller said he purchased this in Erfoud, Morocco, in September 2012 as part of a lot from an anonymous Moroccan dealer. A portion of the sample was donated for classification to Cascadia.

Physical characteristics: Fusion crust has weathered to a gray-brown. Interior has chondritic texture and rust haloes. Some veins are visible. Overall gray-tan color.

Petrography: Contains ~ 7% trolite and ~5% metal, with minor (~1-2% of metal) rims of weathering product on some metal grains. Chondrules are poorly defined and grade into coarse-grained transparent matrix. Olivine shows weak mosaic extinction. Chromite occurs as coarse single fractured grains as well as small grains in chromite-plagioclase assemblages. A small FeS-bearing shock vein occurs near one edge of the section.

Geochemistry: Olivine (Fa_25.7±0.7, N = 21), low-Ca pyroxene (Fs_22.3±1.2Wo_1.7±0.5, N = 17), high-Ca pyroxene (Fs_8.0±1.6Wo_45.1±2.3, N = 10).

Specimens: Cascadia holds 41.7 g in two pieces, a polished thin section, and a mounted butt. John Shea holds the main mass.

Data from:
  MB105
  Table 0
  Line 0:

Date:	P 3 May 2013
Mass (g):	213
Pieces:	1
Class:	L6
Shock stage:	S4
Weathering grade:	W1
Fayalite (mol%):	25.7±0.7
Ferrosilite (mol%):	22.3±1.2
Wollastonite (mol%):	1.7±0.5
Classifier:	M. Ream, A. Ruzicka, M. Hutson, Cascadia
Type spec mass (g):	41.7
Type spec location:	Cascadia
Main mass:	John A. Shea, 201 East Rose Valley Rd, Wallingford, PA, 19086
Comments:	Lab number CML0758; 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. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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