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Northwest Africa 13765
Basic information Name: Northwest Africa 13765
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13765
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 82.1 g
Classification
  history:
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 269 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 13 Mar 2021
Revised 4 Apr 2021: Aligning classification with text
Writeuphelp
Writeup from MB 110:

Northwest Africa 13765 (NWA 13765)

Boujdour, Morocco

Find: 2014

Classification: HED achondrite (Eucrite)

History: Purchased by Douglas Chenin from a Moroccan meteorite dealer in 2014. Reportedly found the same year at Jrifia near Boujdour, Morocco.

Physical characteristics: This meteorite is a single stone covered in black shiny fusion crust. Numerous fine cracks are present on the surface, small chipped spots reveal light tan colored interior. A freshly cut window shows a fine-grained texture with white feldspar grains and light gray pyroxene grains.

Petrography: (C. Agee, UNM) Electron microprobe analysis of a polished mount shows a mildly brecciated rock having clasts with variable grain size. The finest grained clasts have plagioclase and pyroxene in size range 50-200 μm. Coarser grained clasts show elongate plagioclase up to 500 μm and equant pyroxene 100-400 μm. Very fine exsolution lamellae are present in both low-Ca pyroxene and augite. Chromite, Fe-metal, silica, and ilmenite are ubiquitous accessory minerals.

Geochemistry: (C. Agee, UNM) Low-Ca pyroxene Fs61.5±2.2Wo3.0±1.2, Fe/Mn=31±2, n=10; augite Fs27.3±0.5Wo43.5±0.6, Fe/Mn=31±2, n=10; plagioclase An88.9±0.8Ab10.5±0.7Or0.6±0.3, n=6. Compositionally uniform throughout with some grain size variation from clast to clast. Pyroxenes show nearly complete chemical compositional separation between low-Ca pyroxene and augite.

Classification: Monomict eucrite.

Specimens: 16.5 g on deposit at UNM, D. Chenin holds the main mass.

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Boujdour
Origin or pseudonym:Jrifia
Place of purchase:Morocco
Date:2014
Mass (g):82.1
Pieces:1
Class:Eucrite
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):61.5±2.2, 27.3±0.5
Wollastonite (mol%):3.0±1.2, 43.5±0.6
Classifier:C. Agee, UNM
Type spec mass (g):16.5
Type spec location:UNM
Main mass:D. Chenin
Comments:Submitted by C. Agee
Institutions
   and collections
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 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:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Domjan Svilkovic   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is the only approved meteorite from Boujdour, Morocco
     This is 1 of 1903 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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