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Northwest Africa 14257
Basic information Name: Northwest Africa 14257
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14257
Observed fall: No
Year found: 2013
Country: Morocco
Mass:help 68.8 g
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 18 Sep 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 14257 (NWA 14257)

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: 6 pieces - description is of largest stone (~3.5 cm). Dark, sandblasted with intact fusion crust remaining on exterior. Irregular white and grey clasts, no observable melt veins in hand specimen.

Petrography: The meteorite displays a relatively coarse-grained texture with larger, subrounded clast of pyroxene (up to ~ 2 mm) and plagioclase (up to ~ 3 mm). Pyroxene exsolution lamellae are observed with a wide range of thicknesses( from ~ 2.5-10 µm). Known accessory phases include: A silica phase and chromite.

Geochemistry: Mineral Composition and Geochemistry: (T. J. Barrett, T. S. Hayden, OU) Feldspar (An90Ab10, n = 17), orthopyroxene (Fs54±1En43±2Wo3±1, FeO/MnO = 31±4, Mg# = 44±2, n = 41), pigeonite (Fs50±3En40±2Wo10±4, FeO/MnO = 30±2, Mg# = 45±2, n = 30), augite (Fs27±5En34±2Wo39±6, FeO/MnO = 30±3, Mg# = 56±4, n = 16).

Classification: Eucrite

Specimens: 25.8 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:6
Class:Eucrite
Weathering grade:low to m
Ferrosilite (mol%):48
Wollastonite (mol%):13
Classifier:T. J. Barrett, T. S. Hayden, OU
Type spec mass (g):25.8
Type spec location:OU
Main mass:Graham Ensor
Finder:Unknown Nomads
Comments:Field name prior to submission: GRAH 44; 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
Coordinates:Unknown.

Statistics:
     This is 1 of 1929 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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