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Northwest Africa 15296
Basic information Name: Northwest Africa 15296
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15296
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 2 kg
Recommended:  L-melt rock    [explanation]

This is 1 of 50 approved meteorites classified as L-melt rock.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 23 Feb 2023
Writeup from MB 112:

Northwest Africa 15296 (NWA 15296)

(Northwest Africa)

Purchased: 2022

Classification: Ordinary chondrite (L, melt rock)

History: The meteorite was reportedly found 2021 in Mali and subsequently purchased from a meteorite dealer in Algeria.

Physical characteristics: Many dark brownish fragments without fusion crust.

Petrography: The igneous rock displays a granular texture of predominantly 30-200 µm sized partly euhedral olivine and pyroxene grains together with interstitial Si,Al-rich mesostasis. Olivine shows weak and pyroxene strong compositonal zoning. Pyroxene are often overgrown by thin augite margins. Opaque phases are chromite, sulfides, and rare FeNi metal typically occurring as blebs in the mesostasis. Neither feldspar nor relict chondrules detected. The meteorite contains shock melt veins and pockets.

Geochemistry: olivine: Fa25.3±1.2 (Fa23.8-28.3, FeO/MnO=47±3, n=10); pyroxene: Fs16.3±2.2Wo15.0±13.1 (Fs12.7-18.8Wo2.2-34.8, FeO/MnO=24±3, n=15); mesostasis (wt%): SiO2: 68.5±1.4, Al2O3: 19.5±0.5, Na2O: 3.77±0.32, K2O: 0.65±0.04, CaO: 2.22±0.12, MgO: 0.54±0.10, FeO: 1.32±0.29, TiO2: 0.09±0.03, N=7

Classification: L-melt rock. The silicate composition do not exactly fit the range for equilibrated L chondrites, but this is often the case with chondritic melt rocks, and L is the closest match.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2022
Mass (g):2000
Class:L-melt rock
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):25.3
Ferrosilite (mol%):16.3
Wollastonite (mol%):15.0
Classifier:A. Greshake, MNB
Type spec mass (g):20
Type spec location:MNB
Main mass:Mateusz Szyszko
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 Meteoritical Bulletin, no. 112, in preparation (2023)
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Public domain photographs:
Ansgar Greshake      

     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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