Meteoritical Bulletin: Entry for Northwest Africa 12942

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Northwest Africa 12942

Basic information

Name: Northwest Africa 12942
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12942
Observed fall: No
Year found: 2014
Country: Morocco
Mass: 32.7 g

Classification
history:

Meteoritical Bulletin:	MB 109	(2020)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 603 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 2 May 2020

Writeup

help

Writeup from MB 109:

Northwest Africa 12942 (NWA 12942)

Morocco

Purchased: 2014

Classification: HED achondrite (Eucrite)

History: Purchased from A. Aaronson in 2014 at the Tucson Gem and Mineral Show, who provided origin of sample as being from Morocco. Catalogued in the Royal Ontario Museum collection as LM58152

Physical characteristics: The meteorite has a well-preserved, dark fusion crust, with very minor weathering. Interior of the meteorite intact, uniform and pale gray, with visible thin, black veins and very fine-grained texture.

Petrography: Breccia composed almost entirely of crystal fragments set in a finely comminuted matrix. Crystal fragments range from 60 by 70 μm to 1200 by 600 μm. One gabrroic textured clast, measuring 0.5 by 0.4 cm, is present. Shock state is high as evidenced by strong mosaicism and fracturing of mineral grains.

Geochemistry: Mineral composition and geochemistry: Plagioclase composition: An_88.38±3.21Or_0.09±0.03(n=11). Low Ca-pyroxene composition: Fs_42.98±14.37Wo_6.39±4.74and FeO/MnO = 30.92±1.10 (n =20). High Ca-pyroxene composition: Fs_31.81±1.48Wo_28.47±9.97.and FeO/MnO = 30.97±0.71 (n=3).

Classification: (K. Tait, ROM) Texture and compositions suggest the sample is a polymict eucrite breccia.

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Tucson Gem and Mineral Show
Date:	P 2014
Mass (g):	32.65
Pieces:	1
Class:	Eucrite
Shock stage:	high
Weathering grade:	low
Ferrosilite (mol%):	42.98±14.37; 31.81±1.48
Wollastonite (mol%):	6.39±4.74; 28.47±9.97
Classifier:	K. Tait, I. Nicklin, ROM
Type spec mass (g):	6.53
Type spec location:	ROM
Main mass:	Dr. David Gregory
Comments:	Submitted by V. Di Cecco, ROM

Institutions
and collections

ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 109, in preparation (2020)

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Geography:

Morocco

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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