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Northwest Africa 13669
Basic information Name: Northwest Africa 13669
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13669
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 139.2 g
Meteoritical Bulletin:  MB 110  (2022)  Martian (nakhlite)
Recommended:  Martian (nakhlite)    [explanation]

This is 1 of 32 approved meteorites classified as Martian (nakhlite).   [show all]
Search for other: Martian meteorites
Comments: Approved 18 Jan 2021
Writeup from MB 110:

Northwest Africa 13669 (NWA 13669)

(Northwest Africa)

Purchased: 2020 Dec

Classification: Martian meteorite (Nakhlite)

History: Purchased in December 2020 by Said Yousfi from a dealer near the Morocco-Algeria border and then acquired jointly by Mendy Ouzillou and Dustin Dickens.

Physical characteristics: This somewhat friable specimen was found in several pieces (total weight 139.2 g, comprising stones of 66.1 g and 21.4 g plus other smaller fragments). The two larger stones are partially covered by black fusion crust as are some of the fragments.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The specimen has a cumulate texture with a mean grainsize of ~1.2 mm. It is composed of zoned augite, olivine, zoned ferropigeonite (with ferrosilite rims) and plagioclase together with accessory titanomagnetite (with octahedral ilmenite exsolution lamellae), chlorapatite, pyrrhotite and intercumulus mesostasis (consisting of K-rich glass with ferropigeonite microlites plus subhedral grains of titanomagnetite and chlorapatite). Olivine contains veinlets of very fine grained, inhomogeneous Fe-rich "iddingsitic" material with oxide sums ~89 wt.%, and augite contains rare glassy melt inclusions (surrounded by radial cracks).

Geochemistry: Augite (Fs22.8-37.6Wo40.5-34.9, FeO/MnO = 31-35, N = 5), olivine (Fa72.3-74.5, FeO/MnO = 47-48, N = 3), ferropigeonite (Fs56.4-61.8Wo11.6-6.5, FeO/MnO = 33-34, N = 2), ferrosilite rim (Fs70.9Wo3.0, FeO/MnO = 34), plagioclase (An34.3-37.2Or3.3-3.0, N = 2), ferropigeonite in mesostasis (Fs57.6Wo11.7, FeO/MnO = 31), titanomagnetite (TiO2 6.8 wt.%, Cr2O3 0.6 wt.%).

Classification: Nakhlite.

Specimens: 20.2 g including a polished mount at UWB; remainder with Mr. M. Ouzillou and Mr. D. Dickens.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020 Dec
Mass (g):139.2
Class:Martian (nakhlite)
Shock stage:low
Weathering grade:low
Fayalite (mol%):72.3-74.5
Ferrosilite (mol%):22.8-37.6; 56.4-62.8
Wollastonite (mol%):40.5-34.9; 11.7-6.5
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.2
Type spec location:UWB
Main mass:M. Ouzillou and D. Dickens
Comments:Work name SY 79; submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
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 9558 approved meteorites from (Northwest Africa) (plus 1872 unapproved names)

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