Meteoritical Bulletin: Entry for Northwest Africa 14257

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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: 68.8 g

Classification
history:

Recommended:

Eucrite [explanation]

This is 1 of 515 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 18 Sep 2021

Writeup

help

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 (Fs_54±1En_43±2Wo_3±1, FeO/MnO = 31±4, Mg# = 44±2, n = 41), pigeonite (Fs_50±3En_40±2Wo_10±4, FeO/MnO = 30±2, Mg# = 45±2, n = 30), augite (Fs_27±5En_34±2Wo_39±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 Meteoritical Bulletin, no. 110, in preparation (2021)

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Geography:

Morocco

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 1676 approved meteorites from Morocco (plus 25 unapproved names) (plus 1 impact crater)

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