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Ben Kesbes 002
Basic information Name: Ben Kesbes 002
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 29.3 g
Meteoritical Bulletin:  MB 110  (2022)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 326 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 6 May 2021
Writeup from MB 110:

Ben Kesbes 002        30.567347, 4.960781

Ouargla, Algeria

Find: 2020

Classification: Martian meteorite (Shergottite)

History: Two stones 12.12 g and 8.12 g were purchased from Aziz Zad in August 2020, an Algerian meteorite dealer, were reportedly found by a nomad on May 13, 2020, about 160 km south of the city of Ouargl. A third stone 9.07 g was purchased from Fabien Kuntz in January 2020 and was also reportedly found in the same location (in Algeria in the Ouargla area). In this classification we determined, through SEM and EMPA analyses of the three stones, that they are petrologically and geochemically identical.

Physical characteristics: Three individual stones, 12.12 g, 9.07 g, 8.12 g, all covered with fresh, shiny black fusion crust. Visually all three stones are identical in appearance.

Petrography: (C. Agee, UNM) The two major phases in this meteorite are clinopyroxene and maskelynite. Ubiquitous minor phases are merrillite, apatite, titanomagnetite, ilmenite and troilite. The clinopyroxene has a modal abundance of approximately 60%, with significant core to rim zoning observed in backscattered electron images indicating an igneous crystallization trend with Mg-rich pigeonite cores, mantled by augite, and rimmed with ferropigeonite. Clinopyroxene average grain size is approximately 300-500 μm. Maskelynite has modal abundance of approximately 30%, most grains are thin and elongate with maximum length ~1 mm.

Geochemistry: (C. Agee, UNM) Clinopyroxene Fs52.0±21.4Wo22.0±8.9, core to rim range Fs32.6Wo17.7(Mg-pigeonite) – Fs24.7Wo38.7 (augite) – Fs86.0Wo12.6 (ferropigeonite), Fe/Mn=36±4, n=20; maskelynite An51.3±3.7Ab46.6±2.5Or2.1±1.3, n=7. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave δ18O= 4.865, 4.900, 4.820; δ17O= 2.810, 2.826, 2.814; Δ17O= 0.241, 0.239, 0.269 (linearized, all per mil, TFL slope=0.528).

Classification: Evolved pyroxene-phyric basalt, clinopyroxene compositional zoning trends are similar to QUE 94201. Paired with NWA 12522, NWA 12550, and NWA 12960.

Specimens: 5.87 g plus a polished thin section on deposit at UNM, Michael Doran holds three stones described above.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Mass (g):29.31
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):52.0±21.4
Wollastonite (mol%):22.0±8.9
Classifier:C. Agee, UNM
Type spec mass (g):5.87
Type spec location:UNM
Main mass:Michael Doran
Comments:Submitted by C. Agee
Plots: O isotopes:  
   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)
Kuntz: Fabien Kuntz, France; Website (private address)
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Photos from the Encyclopedia of Meteorites:
Michael Doran   

     Recommended::   (30° 34' 2"N, 4° 57' 39"E)

     This is 1 of 50 approved meteorites from Ouargla, Algeria (plus 1 unapproved name)
     This is 1 of 1374 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)
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