Meteoritical Bulletin: Entry for Northwest Africa 11340

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Northwest Africa 11340

Basic information

Name: Northwest Africa 11340
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11340
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass: 180 g

Classification
history:

Meteoritical Bulletin:	MB 106	(2018)	L3.15
Recommended:			L3.15 [explanation]

This is 1 of 9 approved meteorites classified as L3.15. [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 28 Jun 2017

Writeup

help

Writeup from MB 106:

Northwest Africa 11340 (NWA 11340)

(Northwest Africa)

Purchased: 2017

Classification: Ordinary chondrite (L3.15)

History: Purchased by Dustin Dickens in Morocco, March 2017.

Physical characteristics: Single stone with weathered exterior. Saw cut shows many densely packed chondrules set in dark-brown matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous porphyritic chondrules, most with mesostasis or glass. Abundant opaque matrix. Apparent mean chondrule diameter 586±318 μm, n=21.

Geochemistry: (C. Agee and B. Ha, UNM) Chondrule olivine Fa_17.9±9.7, Cr₂O₃=0.21±0.22 (wt%), n=29; chondrule low-Ca pyroxene Fs_9.7±6.7Wo_0.5±0.4, n=7.

Classification: Ordinary chondrite (L3.15), subtype 3.15 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 (Grossman and Brearley, 2005).

Specimens: 20.7 g including a probe mount on deposit at UNM, Dustin Dickens 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:
  MB106
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2017
Mass (g):	180
Pieces:	1
Class:	L3.15
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	17.9±9.7
Ferrosilite (mol%):	9.7±6.7
Wollastonite (mol%):	0.5±0.4
Classifier:	C. Agee, UNM
Type spec mass (g):	20.7
Type spec location:	UNM
Main mass:	Dustin Dickens
Comments:	DD-11; 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 Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.

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Geography:

Coordinates:

Unknown.

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

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