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Northwest Africa 13918
Basic information Name: Northwest Africa 13918
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13918
Observed fall: No
Year found: 2013
Country: Morocco
Mass:help 68.8 g
Recommended:  Eucrite    [explanation]

This is 1 of 587 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 17 Jul 2021
Writeup from MB 110:

Northwest Africa 13918 (NWA 13918)


Purchased: 2013

Classification: HED achondrite (Eucrite)

History: A single stone found in Morocco by nomads. Purchased by Graham Ensor in Ensisheim, France, in 2013. Date of find unknown.

Physical characteristics: Physical Characteristics: Physical Characteristics: Dark, sandblasted with minor amounts of fusion crust remaining. Irregular lighter clasts with impact melt veins.

Petrography: The meteorite exhibits extensive melt veining, large irregular clasts of pyx and plag ranging in size from 1.2 to 9.6 mm, heavily brecciated although internal to clasts less brecciation is observed. Pyroxene exsolution lamellae are observed. Accessory phases include ilmenite, chromite, silica phase, diopside.

Geochemistry: Mineral Composition and Geochemistry: (T. J. Barrett, T. S. Hayden, OU) Feldspar (An90Ab10, n=29), orthopyroxene (Fs60En37Wo3??, FeO/MnO = 30.94, Mg# = 27.97–40.25, n=30), pigeonite (Fs55En35Wo10, FeO/MnO = 31.45, Mg# = 34.84–40.47, n=21), augite (Fs38En31Wo31, FeO/MnO = 33.08, Mg# = 24.5–47, n=20).

Classification: Eucrite

Specimens: 14 g type specimen held at OU. Graham Ensor holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Ensisheim
Date:P 2013
Mass (g):68.8
Weathering grade:low to m
Ferrosilite (mol%):52
Wollastonite (mol%):14
Classifier:T. J. Barrett, T. S. Hayden, OU
Type spec mass (g):14
Type spec location:OU
Main mass:Graham Ensor
Finder:Unknown nomads
Comments:Field name prior to submission: GRAH 43; submitted by T. J. Barrett OU
   and collections
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
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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     This is 1 of 1991 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

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