Meteoritical Bulletin: Entry for Northwest Africa 10297

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Northwest Africa 10297

Basic information

Name: Northwest Africa 10297
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10297
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass: 900 g

Classification
history:

Meteoritical Bulletin:	MB 104	(2015)	L3
Recommended:			L3 [explanation]

This is 1 of 819 approved meteorites (plus 1 unapproved name) classified as L3. [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 8 Sep 2015

Writeup

help

Writeup from MB 104:

Northwest Africa 10297 (NWA 10297)

(Northwest Africa)

Purchased: 2015 Jan

Classification: Ordinary chondrite (L3)

History: Purchased by Marcin Cimała in Zagora, January 2015.

Physical characteristics: Single stone with weathered exterior. A saw cuts shows many densely packed chondrules set in orange-brown matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous porphyritic chondrules, most with mesostasis or glass. Scattered opaque matrix. Apparent mean chondrule diameter 714±303 μm, n=20.

Geochemistry: (C. Agee and N. Muttik, UNM) Chondrule olivine Fa_22.1±10.4, Cr₂O₃=0.05±0.04 (wt%), n=30; chondrule low-Ca pyroxene Fs_19.2±12.9Wo_1.6±1.6, n=12.

Classification: Ordinary chondrite (L3), estimated subtype L3.5 based on mean value of Fa and 1-sigma standard deviation, and on the ferroan olivine mean value of Cr₂O₃ and 1-sigma standard deviation, similar to Chainpur L3.4 and Tieschitz L3.6 (Grossman and Brearley, 2005).

Specimens: 20.6 g including a probe mount on deposit at UNM, Marcin Cimała 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:	Zagora
Date:	P 2015 Jan
Mass (g):	900
Pieces:	1
Class:	L3
Shock stage:	S3
Weathering grade:	W2
Fayalite (mol%):	22.1±10.4
Ferrosilite (mol%):	19.2±12.9
Wollastonite (mol%):	1.6±1.6
Classifier:	C. Agee, UNM
Type spec mass (g):	20.6
Type spec location:	UNM
Main mass:	Marcin Cimala
Comments:	Field name MC 131; 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. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
John A. Shea
Woreczko Jan & Wadi

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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