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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 251 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 Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is the only approved meteorite from Boujdour, Morocco
     This is 1 of 1647 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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