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Northwest Africa 13915
Basic information Name: Northwest Africa 13915
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13915
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 29.7 g
Recommended:  Diogenite-melt breccia    [explanation]

This is 1 of 8 approved meteorites classified as Diogenite-melt breccia.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 6 May 2021
Writeup from MB 110:

Northwest Africa 13915 (NWA 13915)

(Northwest Africa)

Purchased: 2021

Classification: Diogenitic melt breccia

History: The meteorite was purchased from a group of meteorites hunters in Nouadhibou, Mauritania, in late 2020.

Physical characteristics: Brownish rock without fusion crust.

Petrography: The meteorite is an achondritic melt breccia predominantly consisting of up to 700 µm sized diogenetic pyroxene, olivine, and calcic plagioclase crystals set in a recrystallized matrix dominated by low-Ca pyroxene displaying mottled compositional zoning and small feldspar grains. Vesicles are abundant in the matrix and the mineral fragments frequently show resorption features at their contact with the melt. Pyroxene and olivine occur as both, compositionally homogeneous and strongly zoned grains that often contain blebby FeS inclusions. Some chromite-orthopyroxene symplectites are present in olivine. Minor phases are silica, chromite, ilmenite, and FeS. No metallic iron has been found. Eucritic material, i.e., exsolved pigeonite is absent.

Geochemistry: diogenetic pyroxene: Fs20.8±0.1Wo1.4±0.02 (Fs20.7-21.1Wo1.3-1.4, FeO/MnO=25-30, n=8); zoned diogenetic pyroxene: Fs20.5±5.7Wo3.2±2.1 (Fs16.5-30.3Wo1.8-6.8, FeO/MnO=25-29, n=8); matrix pyroxene displaying patchy zoning: Fs32.9±1.3Wo7.8±1.3 (Fs31.6-35.6Wo6.3-10.6, FeO/MnO=25-29, n=8); strongly zoned olivine: Fa17.9±9.1 (Fa7.4-29.0, FeO/MnO=40±6, n=8); weakly zoned olivine: Fa35.4±2.3 (Fa30.9-37.6, FeO/MnO=45±2, n=8); calcic plagioclase: An93.9±1.1 (An91.9-95.2, n=10)

Classification: Diogenite (melt breccia)

Data from:
  Table 0
  Line 0:
Place of purchase:Nouadhibou, Mauritania
Date:P 2021
Mass (g):29.7
Class:Diogenitic melt breccia
Shock stage:high
Weathering grade:low
Fayalite (mol%):17.9; 35.4
Ferrosilite (mol%):20.8; 20.5; 32.9
Wollastonite (mol%):1.4; 3.2; 7.8
Classifier:A. Greshake, MNB
Type spec mass (g):7
Type spec location:MNB
Main mass:Salamu Ali
Comments:Submitted by Ansgar Greshake
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
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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Public domain photographs:
Ansgar Greshake            

     This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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