Meteoritical Bulletin: Entry for Northwest Africa 10906

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Northwest Africa 10906

Basic information

Name: Northwest Africa 10906
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10906
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass: 124 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	Howardite
Recommended:			Howardite [explanation]

This is 1 of 451 approved meteorites classified as Howardite. [show all]
Search for other: Achondrites, HED achondrites, and Howardites

Comments:

Approved 26 Nov 2016

Writeup

help

Writeup from MB 105:

Northwest Africa 10906 (NWA 10906)

(Northwest Africa)

Purchased: 2016

Classification: HED achondrite (Howardite)

History: Purchased by Morten Bilet, June 2016, in Ensisheim, from a Moroccan meteorite dealer.

Physical characteristics: Single stone with fusion crust, saw cut shows a polymict breccia with light and dark clasts set in a fine-grained matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows three distinct lithologies: 1) diogenitic (~28%), 2) cumulate eucritic (~44%), 3) basaltic eucritic (~28%). Most pyroxene and plagioclase are fragmental to fine-grained cataclastic, although there are some larger diogenitic clasts with relatively coarse pyroxene grains. Exsolution lamellae in pyroxene is common. There are two distinct plagioclase populations, anorthitic and bytownitic.

Geochemistry: (C. Agee and M. Spilde, UNM) Diogenite low-Ca pyroxene Fs_28.9±3.9Wo_3.8±1.2, Fe/Mn=31±2, n=6, eucrite-cm low-Ca pyroxeneFs_46.2±4.3Wo_4.6±3.1, Fe/Mn=33±2, n=9; eucrite pigeonite Fs_51.9±5.4Wo_12.2±4.7, Fe/Mn=32±1, n=6; anorthite An_93.0±1.5, n=5; bytownite An_84.7±2.4, n=2.

Classification: Howardite

Specimens: 20 g including a probe mount on deposit at UNM, Morten Bilet holds the main mass.

Data from:
  MB105
  Table 0
  Line 0:

Place of purchase:	Ensisheim
Date:	P 2016
Mass (g):	124
Pieces:	1
Class:	Howardite
Shock stage:	high
Weathering grade:	low
Ferrosilite (mol%):	28.9±3.9, 46.2±4.3, 51.9±5.4
Wollastonite (mol%):	3.8±1.2, 4.6±3.1, 12.2±4.7
Classifier:	C. Agee, UNM
Type spec mass (g):	20
Type spec location:	UNM
Main mass:	Morten Bilet
Comments:	MB-4; submitted by C. Agee

Institutions
and collections

UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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