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Northwest Africa 10463
Basic information Name: Northwest Africa 10463
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10463
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 203 g
Meteoritical Bulletin:  MB 105  (2016)  Angrite
Recommended:  Angrite    [explanation]

This is 1 of 43 approved meteorites classified as Angrite.   [show all]
Search for other: Achondrites, Angrites
Comments: Approved 18 Jan 2016
Writeup from MB 105:

Northwest Africa 10463 (NWA 10463)

(Northwest Africa)

Purchased: 2015 Aug 4

Classification: Angrite

History: Purchased on August 4, 2015, from Aziz Habibi in Erfoud, Morocco.

Physical characteristics: Single mass, coated in desert soil, no fusion crust. Broken surfaces show a fresh polycrystalline aggregate of mm-size 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 in diameter, with stubby plagioclase laths (~15%) up to 300 μm in length. Some olivines have exsolved kirschsteinite. Accessory titanium-iron oxides and troilite were observed.

Geochemistry: (C. Agee, N. Muttik, A. Santos, UNM) Fassaite Fs21.6±7.9Wo53.5±1.2, range: Fs16.2-32.7, Fe/Mn=104±17, Al2O3 (wt%)=8.1±1.6, n=12; olivine Fa59.7±14.8Lrn3.9±2.1, range Fa32.6-79.6, Fe/Mn=88±9, n=16; kirschsteinite Fa47.7±1.7Lrn43.5±1.2, Fe/Mn=69±2, n=4; plagioclase An99.4±0.1, n=3.

Classification: Based on the strong igneous zoning of olivine and fassaite this is likely an angrite. It lacks a fine-grained groundmass found in more quickly cooled angrites, and shows kirschsteinite exsolution in olivine. Although there are some textural similarities with NWA 4590, and broadly similar fassaite compositions to LEW 87051, this meteorite is likely unpaired, thus representing a new angrite type.

Specimens: 20.6 g including a probe mount on deposit at UNM, DPitt holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2015 Aug 4
Mass (g):202.5
Shock stage:low
Weathering grade:low
Fayalite (mol%):59.7±14.8
Ferrosilite (mol%):21.6±7.9
Wollastonite (mol%):53.5±1.2
Classifier:C. Agee, UNM
Type spec mass (g):20.63
Type spec location:UNM
Main mass:DPitt
Comments:Submitted by C. Agee
   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)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)

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

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