Meteoritical Bulletin: Entry for Northwest Africa 10258

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Northwest Africa 10258

Basic information

Name: Northwest Africa 10258
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10258
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass: 58 g

Classification
history:

Meteoritical Bulletin:	MB 104	(2015)	Lunar (feldsp. breccia)
Recommended:			Lunar (feldsp. breccia) [explanation]

This is 1 of 340 approved meteorites classified as Lunar (feldsp. breccia). [show all]
Search for other: Lunar meteorites

Comments:

Approved 8 Sep 2015

Writeup

help

Writeup from MB 104:

Northwest Africa 10258 (NWA 10258)

(Northwest Africa)

Purchased: 2015

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Steve Arnold from Morocco, 2015.

Physical characteristics: Single stone, dark irregular surface, no fusion crust. A saw cut reveals numerous light-colored clasts set in a dark groundmass.

Petrography: (C. Agee, UNM) This meteorite is mixture of a fine-grained cataclastic domains, fragmental plagioclase and pyroxene crystals, fragmental anorthosite clasts, and shock melt veins; some of the veins have ~200 μm-size vesicles. Accessory troilite, ilmenite, and chromite were observed.

Geochemistry: (C. Agee and N. Muttik, UNM) olivine Fa_37.9±1.3, Fe/Mn=98±7, n=6; pigeonite Fs_38.9±13.7Wo_11.5±6.0, Fe/Mn=62±10, n=5; augite Fs_22.7Wo_40.0, Fe/Mn=57±5, n=1; plagioclase An_96.2±0.5, n=3; Shock melt (20 μm defocused electron beam, proxy for bulk meteorite composition): SiO₂=46.3±1.8, TiO₂=0.44±0.18, Al₂O₃=26.9±5.3, Cr₂O₃=0.014±0.10, MgO=5.6±2.7, FeO=6.4±3.2, MnO=0.08±0.05, CaO=14.4±2.0, NiO=0.03±0.03, Na₂O=0.54±0.24, K₂O=0.14±0.07 (all wt%), MgO+FeO=12.1±5.5 (wt%), n=11.

Classification: Lunar (feldspathic breccia)

Specimens: 11.7 g including a probe mount on deposit at UNM, Steve Arnold holds the main mass.

Data from:
  MB104
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2015
Mass (g):	58
Pieces:	1
Class:	Lunar (feldsp. breccia)
Shock stage:	high
Weathering grade:	moderate
Fayalite (mol%):	37.9±1.3
Ferrosilite (mol%):	38.9±13.7
Wollastonite (mol%):	11.5±6.0
Classifier:	C. Agee, UNM
Type spec mass (g):	11.7
Type spec location:	UNM
Main mass:	Steve Arnold
Comments:	Fieldname SA-12; 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)

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:
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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
John Tanner

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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