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Northwest Africa 13269
Basic information Name: Northwest Africa 13269
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13269
Observed fall: No
Year found: 2019
Country: Mauritania
Mass:help 740 g
Classification
  history:
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 99 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 5 Apr 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13269 (NWA 13269)

Mauritania

Purchased: 2019

Classification: HED achondrite (Eucrite, unbrecciated)

History: Purchased in December 2019 by Didi Baidari from a Mauritanian meteorite dealer.

Physical characteristics: Two matching stones. Fusion crust typical of eucrites, black and shiny with swirls. Broken surface showing scattered phenocrysts of pyroxene up to 4mm in size all embedded in a grey matrix. The stone is unbrecciated.

Petrography: (T. Shisseh, FSAC) Fusion crust is 30-100 μm thick and penetrates the interior up to 1.5mm in some areas. Porphyritic texture with pyroxene phenocrysts up to 2-4 mm embedded in a matrix dominated by equilibrated pyroxene showing exsolution lamella with remnant-Ca zoning in rims plus variolitic and blocky plagioclase. Minor phases are silica, chromite, ilmenite and troilite. Pyroxene phenocrysts show rare tiny (~1um) chromite and high-Ca exsolution lamella with often plagioclase veinlets associated with chromite. Clouding is frequently observed in pyroxene and plagioclase located in the matrix. Pyroxenes have minute inclusions of plagioclase, troilite and chromite. Plagioclase clouding is mostly dominated by pyroxene inclusions. Mesostasis is present commonly located between plagioclase laths.

Geochemistry: (T. Shisseh, FSAC and C. Agee, UNM) Pyroxene phenocrysts Fs51±1.6 Wo2.4±0.7, Fe/Mn=31±1, Mg#=47±1.7 (n=15); high-Ca pyroxene in matrix: Fs25±7.5 Wo38±9.3 Fe/Mn=28±1.5, Mg#=58±5 (n=8); low-Ca pyroxene in matrix: Fs48±5.2 Wo11.5±6. Fe/Mn=30±0.8, #Mg=45±2 (n=3); plagioclase in matrix An82±3.2Ab15±2.8Or2±2.5 (n=15); plagioclase veinlets in pyroxene phenocrysts An97±0.2Ab2.7±0.18Or0.07±0.07 (n=3). Chromite associated with plagioclase veinlets Chr67.8±1.7 Uvp7±1.5 Spl23±2.7 (n=3).

Classification: Unbrecciated eucrite

Specimens: 58.4 g including a probe mount on deposit at UNM, Didi Baidari and Habib Naji hold the main mass.

Data from:
  MB109
  Table 0
  Line 0:
Date:P 2019
Mass (g):740
Pieces:2
Class:Eucrite-unbr
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):51.0±1.6
Wollastonite (mol%):2.4±0.7
Classifier:C. Agee, UNM
Type spec mass (g):58.4
Type spec location:UNM
Main mass:Didi Baidari and Habib Naji
Comments:Field name DB-7; submitted by C. Agee, UNM
Institutions
   and collections
FSAC: Universite Hassan II Casablanca, Faculte des Sciences Ain Chock, Departement de Géologie, BP 5366 Maârif, Casablanca, Morocco (institutional address; updated 9 Jan 2013)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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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