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Northwest Africa 13971
Basic information Name: Northwest Africa 13971
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13971
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 2.5 kg
Recommended:  L-melt rock    [explanation]

This is 1 of 46 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 21 Jun 2021
Writeup from MB 110:

Northwest Africa 13971 (NWA 13971)

(Northwest Africa)

Purchased: 2019

Classification: Ordinary chondrite (L, melt rock)

History: The meteorite was acquired by the mass holder in Mauritania.

Physical characteristics: Brownish rock with some patched of fusion crust.

Petrography: The rock shows an igneous texture of euhedral to subhedral olivine and orthopyroxene 50-100 µm grains with interstitial Si,Al-rich mesostasis. Pyroxene often poikilitically encloses olivine. Olivine and low-Ca-pyroxene show minor compositional zoning and some low-Ca pyroxenes are overgrown by thin Ca-pyroxene margins. Opaque phases include chromite, sulfides, rare FeNi metal, and abundant alteration products. No relict chondrules have been found in the section studied. The meteorite contains shock veins and melt pockets.

Geochemistry: olivine: Fa24.6±0.5 (Fa23.7-25.3, FeO/MnO=44±2, n=15); low-Ca pyroxene: Fs18.4±1.1Wo2.9±1.2 (Fs16.7-20.4Wo1.4-4.6, FeO/MnO=29±2, n=15); Ca-pyroxene rims: Fs15.4±2.5Wo23.2±10.5 (Fs12.6-18.7Wo8.9-34.2, FeO/MnO=22±2, n=6); mesostasis (wt%): SiO2: 70.9±2.3, Al2O3: 22.2±1.3, Na2O: 2.5±1.3, K2O: 0.49±0.02, CaO: 2.00±0.23, MgO: 0.33±0.39, FeO: 1.27±0.87, TiO2: 0.25±0.05, N=6

Classification: Melt rock. Mineral chemistry of olivine and low-Ca pyroxene suggest strong affinity to L chondrites.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2019
Mass (g):2500
Class:L-melt rock
Shock stage:S3
Weathering grade:W3
Fayalite (mol%):24.6
Ferrosilite (mol%):18.4; 15.4
Wollastonite (mol%):2.9; 23.2
Classifier:A. Greshake, MNB
Type spec mass (g):20
Type spec location:MNB
Main mass:Said Muftha Bachir
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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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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