Meteoritical Bulletin: Entry for Northwest Africa 13918

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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: 68.8 g

Classification
history:

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

help

Writeup from MB 110:

Northwest Africa 13918 (NWA 13918)

Morocco

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 (Fs₆₀En₃₇Wo_3??, 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:
  MB110
  Table 0
  Line 0:

Place of purchase:	Ensisheim
Date:	P 2013
Mass (g):	68.8
Pieces:	1
Class:	Eucrite
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

Institutions
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)

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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Geography:

Morocco

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 1991 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

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