Meteoritical Bulletin: Entry for Northwest Africa 11211

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Northwest Africa 11211

Basic information

Name: Northwest Africa 11211
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11211
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass: 305 g

Classification
history:

Meteoritical Bulletin:	MB 106	(2018)	LL3.10
Recommended:			LL3.10 [explanation]

This is 1 of 8 approved meteorites classified as LL3.10. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 21 Apr 2017

Writeup

help

Writeup from MB 106:

Northwest Africa 11211 (NWA 11211)

(Northwest Africa)

Purchased: 2017

Classification: Ordinary chondrite (LL3.10)

History: Purchased by Darryl Pitt from a Moroccan meteorite dealer in February 2017 at the Tucson Gem and Mineral Show.

Physical characteristics: Single stone with fusion crust. A sawn surface reveals many densely packed chondrules of variable size.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous unequilibrated chondrules, apparent mean diameter 750±450 μm (n=25), many with porphyritic, igneous-zoned olivines and pyroxenes, most with glass or mesostasis. Fine-grained matrix was observed throughout.

Geochemistry: (C. Agee and B. Ha, UNM) All olivine range Fa_0.7-33.2, mean value Fa_16.5±7.9, Fe/Mn=47±20, Cr₂O₃=0.42±0.22 (wt%), n=33; mean values for ferroan olivine Fa_18.0±6.5, Fe/Mn=49±18, Cr₂O₃=0.43±0.23 (wt%), n=30; low-Ca pyroxene Fs_10.7±8.7Wo_0.9±0.9, Fe/Mn=26±20, n=21.

Classification: Ordinary chondrite (LL3.10), type 3.10 based on ferroan olivine mean Cr₂O₃ content and sigma from Grossman and Brearley (2005) and by the presence of opaque, S-rich matrix. Cr₂O₃ versus sigma value plots very close to the boundary between type 3.10 and 3.05 in figure 13 of G&B (2005), midway between EET 90161 (L3.05) and the cluster with RC 075 (H3.10), MET 96503 (L3.10), NWA 1756 (LL3.10), NWA 3127 (LL3.10).

Specimens: 20.7 g including a probe mount on deposit at UNM, DPitt 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:	Tucson Gem & Mineral Show
Date:	P 2017
Mass (g):	305
Pieces:	1
Class:	LL3.10
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	16.5±7.9
Ferrosilite (mol%):	10.7±8.7
Wollastonite (mol%):	0.9±0.9
Classifier:	C. Agee, UNM
Type spec mass (g):	20.7
Type spec location:	UNM
Main mass:	Darryl Pitt
Comments:	Submitted by C. Agee

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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)

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 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
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