Meteoritical Bulletin: Entry for Northwest Africa 10646

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Northwest Africa 10646

Basic information

Name: Northwest Africa 10646
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10646
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass: 14 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	Angrite
Recommended:			Angrite [explanation]

This is 1 of 40 approved meteorites classified as Angrite. [show all]
Search for other: Achondrites, Angrites

Comments:

Approved 15 May 2016

Writeup

help

Writeup from MB 105:

Northwest Africa 10646 (NWA 10646)

(Northwest Africa)

Purchased: 2016

Classification: Angrite

History: Purchased by Dustin Dickens, February 2016, from a Moroccan dealer.

Physical characteristics: Single piece, some fine desert soil on surface, partial fresh fusion crust. Broken surfaces show a fresh polycrystalline aggregate of mm-sized green, yellow, and black minerals. Friable.

Petrography: (C. Agee, UNM) This meteorite has a granular texture of fassaite (~50%) and olivine (~30%) up to ~1 mm, with stubby plagioclase laths (~15%) up to 300 μm. Some olivines have exsolved kirschsteinite. Accessory titanium-iron oxides and troilite were observed.

Geochemistry: (C. Agee and M. Spilde, UNM) Fassaite Fs_17.0±7.1Wo_52.7±1.3, range: Fs_12.0-29.6, Fe/Mn=88±16, Al₂O₃ (wt%)=7.6±1.6, TiO₂ (wt%)=1.6±0.9, n=6; olivine Fa_55.4±13.7Lrn3.5±1.6, range Fa_28.7-78.6, Fe/Mn=87±6, n=8; kirschsteinite Fa_49.7Lrn_45.8, Fe/Mn=81, n=1; plagioclase An_99.4±0.1, n=5.

Classification: Angrite based on Fe/Mn, and presence of fassaite, kirschsteinite, and nearly pure anorthite. Paired with NWA 10463.

Specimens: 2.9 g including a probe mount on deposit at UNM, Dustin Dickens holds the main mass.

Data from:
  MB105
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2016
Mass (g):	14
Pieces:	1
Class:	Angrite
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	55.4±13.7
Ferrosilite (mol%):	17.0±7.1
Wollastonite (mol%):	52.7±1.3
Classifier:	C. Agee, UNM
Type spec mass (g):	2.9
Type spec location:	UNM
Main mass:	Dustin Dickens
Comments:	Field name TMS-2; 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. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/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)
Solar Anamnesis

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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