Meteoritical Bulletin: Entry for Northwest Africa 10898

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Northwest Africa 10898

Basic information

Name: Northwest Africa 10898
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10898
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass: 682 g

Classification
history:

Recommended:

LL3.10 [explanation]

This is 1 of 7 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 9 Feb 2020

Writeup

help

Writeup from MB 109:

Northwest Africa 10898 (NWA 10898)

(Northwest Africa)

Purchased: 2015

Classification: Ordinary chondrite (LL3.10)

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

Physical characteristics: Weathered fusion-crusted exterior. Saw cuts reveal well defined, densely packed chondrules, up to 7 mm in diameter, most in the size range 0.5 to 2 mm.

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_18.4±11, Fe/Mn=60±24, Cr₂O₃=0.27±0.16 (wt%), n=18; low-Ca pyroxene Fs_11.0±9.1Wo_1.7±1.0, Fe/Mn=13±9, n=11. Analyses of 43 ferroan olivine gives an average Cr₂O₃ content of 0.284±0.206 wt%.

Classification: Ordinary chondrite (LL3.10) subtype 3.10 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, similar to NWA 3127 (LL3.10) (Grossman and Brearley, 2005), also similar to NWA 7029 (LL3.10).

Specimens: 23.95 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:
  MB109
  Table 0
  Line 0:

Place of purchase:	Northwest Africa
Date:	P 2015
Mass (g):	682.29
Pieces:	1
Class:	LL3.10
Shock stage:	S3
Weathering grade:	W2
Fayalite (mol%):	18.4±11.7
Ferrosilite (mol%):	11.0±9.1
Wollastonite (mol%):	1.7±1.0
Classifier:	C. Agee, UNM
Type spec mass (g):	23.95
Type spec location:	UNM
Main mass:	Sean Tutorow
Comments:	Field name G672; 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. 109, in preparation (2020)

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7688 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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