Meteoritical Bulletin: Entry for Northwest Africa 10904

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Northwest Africa 10904

Basic information

Name: Northwest Africa 10904
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10904
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass: 763 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	L3
Recommended:			L3 [explanation]

This is 1 of 848 approved meteorites (plus 2 unapproved names) classified as L3. [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 21 Nov 2016

Writeup

help

Writeup from MB 105:

Northwest Africa 10904 (NWA 10904)

(Northwest Africa)

Purchased: 2015

Classification: Ordinary chondrite (L3)

History: Purchased in 2015 by Brahim Tahiri in Morocco and sent to his partner Sean Tutorow for analysis.

Physical characteristics: Eleven identical appearing stones. Weathered fusion-crusted exterior. Saw cuts reveal well defined, densely packed chondrules, mean apparent diameter 600±200 μm, n=14.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous porphyritic chondrules, most with glass or mesostasis. Abundant fine-grained, opaque matrix.

Geochemistry: (C. Agee and M. Spilde, UNM) Olivine Fa_22.3±10.4, Fe/Mn=58±21, Cr₂O₃=0.05±0.03 (wt%), n=30; low-Ca pyroxene Fs_14.5±8.6Wo_2.2±4.5, Fe/Mn=22±6, n=10; plagioclase An_79.6Ab_19.8Or_0.6.

Classification: Ordinary chondrite (L3), subtype ~3.5 based on mean values of Fa and Fs and 1-sigma standard deviation, and on the ferroan olivine mean value of Cr₂O₃ and 1-sigma standard deviation, Chainpur (3.4) and Tieschitz (3.6) (Grossman and Brearley, 2005).

Specimens: 22.33 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Bibliography:

Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)

Data from:
  MB105
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2015
Mass (g):	763.26
Pieces:	11
Class:	L3
Shock stage:	S3
Weathering grade:	W2
Fayalite (mol%):	22.3±10.4
Ferrosilite (mol%):	14.5±8.6
Wollastonite (mol%):	2.2±4.5
Classifier:	C. Agee, UNM
Type spec mass (g):	22.33
Type spec location:	UNM
Main mass:	Sean Tutorow
Comments:	Field name G679; submitted by C. Agee, UNM

Institutions
and collections

UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)

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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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Mike Markowitz

Geography:

Coordinates:

Unknown.

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

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Revision
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