Meteoritical Bulletin: Entry for Northwest Africa 11455

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Northwest Africa 11455

Basic information

Name: Northwest Africa 11455
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11455
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass: 263 g

Classification
history:

Meteoritical Bulletin:	MB 106	(2018)	Eucrite-unbr
Recommended:			Eucrite-unbr [explanation]

This is 1 of 144 approved meteorites classified as Eucrite-unbr. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 13 Oct 2017

Writeup

Writeup from MB 106:

Northwest Africa 11455 (NWA 11455)

(Northwest Africa)

Purchased: 2017 Apr

Classification: HED achondrite (Eucrite, unbrecciated)

History: Purchased by Fabien Kuntz in April 2017 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Microgabbroic texture. Major minerals are exsolved pigeonite and calcic plagioclase (as equant grains, mean grainsize ~0.7 mm); accessory minerals include silica polymorph, ilmenite, chromite, troilite and Ni-poor metal.

Geochemistry: Host orthopyroxene (Fs_59.1Wo_2.6, FeO/MnO = 29), clinopyroxene exsolution lamella (Fs_27.5Wo_41.3, FeO/MnO = 28), host clinopyroxene (Fs_27.6Wo_42.5, FeO/MnO = 28), orthopyroxene exsolution lamella (Fs_60.7Wo_2.3, FeO/MnO = 30), plagioclase (An_89.7-89.8Or_0.5-0.6, N = 2).

Classification: Unbrecciated eucrite (microgabbroic).

Specimens: 20.55 g including one polished thin section at PSF; remainder with Kuntz.

Data from:
  MB106
  Table 0
  Line 0:

Place of purchase:	Erfoud
Date:	P 2017 Apr
Mass (g):	262.6
Pieces:	1
Class:	Eucrite-unbr
Shock stage:	low
Weathering grade:	low
Ferrosilite (mol%):	59.1; 27.5; 27.6; 60.7
Wollastonite (mol%):	2.6; 41.3; 42.5; 2.3
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.55
Type spec location:	PSF
Main mass:	F. Kuntz
Comments:	Work name K361; submitted by A. Irving

Institutions
and collections

PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Kuntz: Fabien Kuntz, France; Website (private address)

Catalogs:

References:

Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.

Find references in NASA ADS:
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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Cute child
Denis gourgues
Ryan Upchurch

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9921 approved meteorites from (Northwest Africa) (plus 1838 unapproved names)

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