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Northwest Africa 12910
Basic information Name: Northwest Africa 12910
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12910
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 2.41 kg
Meteoritical Bulletin:  MB 108  (2020)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 485 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 7 Nov 2019
Writeup from MB 108:

Northwest Africa 12910 (NWA 12910)

(Northwest Africa)

Purchased: 2019

Classification: HED achondrite (Diogenite)

History: Purchased by Zuokai Ke from a Moroccan dealer in March 2019.

Physical characteristics: Single stone, ~80% of the surface is covered with fresh black fusion crust. Exposed interior shows pale greenish pyroxene grains and a distinct, very planar, dark colored shock melt vein with numerous small parallel shock melt veins adjacent to it.

Petrography: (C. Agee, UNM; X. Gu, CSU-China) This meteorite is an orthopyroxenite, containing ~98% orthopyroxene that is extremely homogeneous in composition. There is minor, ubiquitous troilite, chromite, silica, and augite. This meteorite has been subjected to high shock levels as many grains are fragmented, and some zones have cataclastic textures. A strikingly prominent shock melt vein crosscuts the entire sample, the composition of which is nearly identical to the host orthopyroxene indicating in-situ melting rather than injection from an exotic external source.

Geochemistry: (C. Agee, UNM; X. Gu, CSU-China): Orthopyroxene Fs23.8±0.1Wo2.2±0.0, Fe/Mn=29±1, n=6; shock melt vein SiO2=55.2±0.4, TiO2=0.07±0.01, Al2O3=0.8±0.5, Cr2O3=0.5±0.2, MgO=26.2±0.4, FeO=15.5±0.5, MnO=0.51±0.01, CaO=1.2±0.3, all wt%, n=6.

Classification: HED (diogenite)

Specimens: 22.7 g including a probe mount on deposit at UNM, Zuokai Ke holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019
Mass (g):2405
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):23.8±0.1
Wollastonite (mol%):2.2±0.0
Classifier:C. Agee, UNM
Type spec mass (g):22.7
Type spec location:UNM
Main mass:Zuokai Ke
Comments:Field name KE-35; 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)
CSU: Department of Geosciences Colorado State University Fort Collins, CO 80523 , United States (institutional address; updated 21 Jan 2019)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 8136 approved meteorites from (Northwest Africa) (plus 1942 unapproved names)

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