Meteoritical Bulletin: Entry for Northwest Africa 11247

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Northwest Africa 11247

Basic information

Name: Northwest Africa 11247
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11247
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass: 830 g

Classification
history:

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

This is 1 of 119 approved meteorites classified as Eucrite-unbr. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 9 Jun 2017

Writeup

Writeup from MB 106:

Northwest Africa 11247 (NWA 11247)

(Northwest Africa)

Purchased: 2017 Jan

Classification: HED achondrite (Eucrite, unbrecciated)

History: Purchased by Eric Twelker in January 2017 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Medium grained (average 0.5 mm) with equigranular texture, and composed predominantly of exsolved pigeonite and calcic plagioclase with accessory silica polymorph, ilmenite (with rutile exsolution lamellae), chromite and stained Ni-free metal.

Geochemistry: Orthopyroxene host (Fs_60.0-60.3Wo_1.9-1.8, FeO/MnO = 30, N = 3), clinopyroxene exsolution lamellae (Fs_26.8-27.8Wo_42.1-40.7, FeO/MnO = 29-33, N =3), plagioclase (An_89.3-90.3Or_0.0-0.6, N = 3).

Classification: Eucrite (unbrecciated, microgabbroic).

Specimens: 22.5 g plus one polished thin section at UWB; remainder with Mr. E. Twelker.

Data from:
  MB106
  Table 0
  Line 0:

Place of purchase:	Tucson
Date:	P 2017 Jan
Mass (g):	829.8
Pieces:	1
Class:	Eucrite-unbr
Shock stage:	low
Weathering grade:	low
Ferrosilite (mol%):	60.0-60.3; 26.8-27.8
Wollastonite (mol%):	1.9-1.8; 42.1-40.7
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	22.5
Type spec location:	UWB
Main mass:	E. Twelker
Comments:	Work name ET17-2; submitted by A. Irving

Institutions
and collections

UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Twelker: Eric Twelker, P.O. Box 844, Port Townsend, WA 98368, United States; Website (private address; updated 1 Dec 2014)

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.

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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