Meteoritical Bulletin: Entry for Northwest Africa 10061

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Northwest Africa 10061

Basic information

Name: Northwest Africa 10061
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10061
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass: 53.8 g

Classification
history:

Meteoritical Bulletin:	MB 104	(2015)	LL3.00
Recommended:			LL3.00 [explanation]

This is 1 of 4 approved meteorites classified as LL3.00. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 11 Apr 2015

Writeup

help

Writeup from MB 104:

Northwest Africa 10061 (NWA 10061)

(Northwest Africa)

Purchased: 2015

Classification: Ordinary chondrite (LL3.00)

History: Purchased by Darryl Pitt from a Moroccan meteorite dealer in Tucson, 2015.

Physical characteristics: One piece with no 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±600 μm (n=50), many with porphyritic, igneous-zoned olivines and pyroxenes, most with glass or mesostasis. Abundant fine-grained matrix throughout.

Geochemistry: (C. Agee, N. Muttik, UNM) All chondrule olivine Fa_13.3±8.1, range Fa_0.7-32.7, n=34; ferroan olivine Fa_14.9±7.2, Fe/Mn=45±22, Cr₂O₃=0.44±0.09 wt%, range Cr₂O₃=0.25-0.62 wt%, n=30; low-Ca pyroxene Fs_11.3±7.4Wo_1.8±2.3, Fe/Mn=20±12, n=21. Aluminous augite present.

Classification: Ordinary chondrite (LL3.00), type 3.00 based on ferroan olivine mean Cr₂O₃ content and sigma from Grossman and Brearley (2005) and by the presence of S-rich matrix. Comparison of Cr₂O₃ in ferroan olivines done using the same microprobe and conditions at UNM gave: NWA 7731 (L3.00) Cr₂O₃=0.43±0.11 wt%, n=98; NWA 8276 (L3.00) Cr₂O₃=0.42±0.10 wt%; Semarkona (LL3.00) Cr₂O₃=0.41±0.09 wt%, n=45.

Specimens: 11.2 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:
  MB104
  Table 0
  Line 0:

Place of purchase:	Tucson
Date:	P 2015
Mass (g):	53.8
Pieces:	1
Class:	LL3.00
Shock stage:	S3
Weathering grade:	W2
Fayalite (mol%):	13.3±8.1
Ferrosilite (mol%):	11.3±7.4
Wollastonite (mol%):	1.8±2.3
Classifier:	C. Agee
Type spec mass (g):	11.2
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 Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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