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Northwest Africa 13368
Basic information Name: Northwest Africa 13368
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13368
Observed fall: No
Year found: 2020
Country: Mauritania
Mass:help 1105 g
Classification
  history:
Recommended:  Martian (nakhlite)    [explanation]

This is 1 of 22 approved meteorites classified as Martian (nakhlite).   [show all]
Search for other: Martian meteorites
Comments: Approved 8 Aug 2020
Revised 9 Aug 2020: Updated info
Writeuphelp
Writeup from MB 109:

Northwest Africa 13368 (NWA 13368)

Mauritania

Purchased: 2020 Jul

Classification: Martian meteorite (Nakhlite)

History: Purportedly found in Mauritania, purchased by Rachid Chaoui in July 2020 from a dealer in Nouakchott, Mauritania, and subsequently acquired by Ben Hoefnagels.

Physical characteristics: A single, rounded pyramidal stone (1105 g) partially coated by degraded black fusion crust. The fresh interior is deep olive green in color and somewhat friable.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL)  The specimen is composed predominantly of euhedral, prismatic cumulus grains of augite (up to 1.3 mm) with thin, more ferroan rims plus subordinate (~4 vol.%) larger grains of olivine (up to 8 mm, with thin, more ferroan rims) and sparse blocky grains of titanomagnetite (up to 0.7 mm) accompanied by a fine grained intercumulus assemblage of cruciform titanomagnetite, fayalite, hedenbergite, silica polymorph, pyrrhotite and alkali feldspathic glass. "Iddingsitic" material occurs in thin veinlets within cumulus olivine grains, and melt inclusions within augite grains contain daughter crystals of chloramphibole (potassic hastingsite).

Geochemistry: Augite (cores Fs22.9-23.0Wo39.2-39.7, FeO/MnO = 30-31, N = 3; rims Fs47.7-50.2Wo33.2-37.9, FeO/MnO = 35-41, N = 2), olivine (cores Fa61.5-62.7, FeO/MnO = 48-49, N = 4; rims Fa79.6-88.3, FeO/MnO = 37-44, N = 4), intercumulus hedenbergite (Fs50.6-53.5Wo41.2-40.6, FeO/MnO = 39-40, N = 2), intercumulus fayalite (Fa92.6-92.7, FeO/MnO = 36-37, N = 2), intercumulus alkali feldspathic glass (approximately Ab60.1An19.4Or20.4).

Classification: Nakhlite. This specimen is very similar in many respects to MIL 03346 and paired specimens from Miller Range, Antarctica. However, it differs in containing sporadic, relatively large grains of titanomagnetite.

Specimens: 29 g including one polished mount at UWB; main mass with Mr. B. Hoefnagels.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2020 Jul
Mass (g):1105
Pieces:1
Class:Martian (nakhlite)
Shock stage:low
Weathering grade:low
Fayalite (mol%):61.5-92.7
Ferrosilite (mol%):22.9-50.2
Wollastonite (mol%):39.7-33.2
Magnetic suscept.:3.95
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):29
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name RC134.1; submitted by A. Irving
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 127 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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