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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
Recommended:  Martian (nakhlite)    [explanation]

This is 1 of 26 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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8037 approved meteorites from (Northwest Africa) (plus 1947 unapproved names)

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