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Northwest Africa 13790
Basic information Name: Northwest Africa 13790
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13790
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 838 g
Meteoritical Bulletin:  MB 110  (2022)  Winonaite
Recommended:  Winonaite    [explanation]

This is 1 of 89 approved meteorites classified as Winonaite.   [show all]
Search for other: Primitive achondrites, Winonaites
Comments: Approved 28 Mar 2021
Writeup from MB 110:

Northwest Africa 13790 (NWA 13790)

(Northwest Africa)

Purchased: 2020 Nov

Classification: Primitive achondrite (Winonaite)

Physical characteristics: Some fragments have fusion crust. The main mass is 131.4 g.

Petrography: (K. Metzler, IfP) Coarse-grained mafic rock, consisting of olivine (~45 vol%), low-Ca pyroxene (~10 vol%), Ca-rich pyroxene (~20 vol%), plagioclase (~10 vol%), Fe-Ni metal (~15 vol%), and small amounts of troilite. Olivine grains with reverse chemical zoning (Mg-rich reduction rims) occur. Metal occurs as isolated grains and as veins up to several cm in length. The rock shows a metamorphic texture with frequent 120° triple junctions at crystal boundaries and partly poikilitic intergrowths. Typical grain sizes vary between 100 and 500 µm. However, cm-sized areas of olivine and pyroxene, respectively, show identical optical orientation.

Geochemistry: Mineral compositions and geochemistry: The mean olivine composition is Fa3.4±0.6 (Fa2.0-4.1; n=15); Fe/Mn (at.): 15.8. The mean low-Ca pyroxene composition is Fs4.4±0.3Wo1.9±0.2 (Fs3.9-5.0Wo1.6-2.2; n=15); Fe/Mn (at.): 12.6. The mean composition of Ca-rich pyroxene is Fs1.3±0.3Wo43.8±0.6 (Fs0.9-2.2Wo42.9-45.1; n=15); Fe/Mn (at.): 10.7. The mean feldspar composition is An20.9±0.7Or3.0±0.5 (An19.9-22.1Or2.1-3.8; n=10).

Classification: Winonaite, based on the mineral chemistry and the high abundance and shape of Fe-Ni metal.

Specimens: Main mass with Ben Hoefnagels. 180 g (14 pieces) with Mohamed Ali Loud.

Data from:
  Table 0
  Line 0:
Place of purchase:Nouadhibou, Mauritania
Date:P 2020 Nov
Mass (g):838
Shock stage:M-S1
Weathering grade:Low
Fayalite (mol%):3.4±0.6
Ferrosilite (mol%):4.4±0.3; 1.3±0.3
Wollastonite (mol%):1.9±0.2; 43.8±0.6
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Ben Hoefnagels
Comments:Submitted by K. Metzler, IfP
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
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 uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Antonello Petriccione   
Cute child   
Guchen Chen   
Public domain photographs:
Knut Metzler      

     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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