0.111g Angrite | Rare Differentiated Meteorite - NWA 10646
|Northwest Africa 10646|
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
This is 1 of 28 approved meteorites classified as Angrite. [show all]
Search for other: Achondrites, Angrites
|Comments:||Approved 15 May 2016|
Writeup from MB 105:
Northwest Africa 10646 (NWA 10646)
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 Fs17.0±7.1Wo52.7±1.3, range: Fs12.0-29.6, Fe/Mn=88±16, Al2O3 (wt%)=7.6±1.6, TiO2 (wt%)=1.6±0.9, n=6; olivine Fa55.4±13.7Lrn3.5±1.6, range Fa28.7-78.6, Fe/Mn=87±6, n=8; kirschsteinite Fa49.7Lrn45.8, Fe/Mn=81, n=1; plagioclase An99.4±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.
|UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)|
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