Meteoritical Bulletin: Entry for Northwest Africa 11747

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Northwest Africa 11747

Basic information

Name: Northwest Africa 11747
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11747
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 32 g

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 19 Apr 2018

Writeup

Writeup from MB 107:

Northwest Africa 11747 (NWA 11747)

(Northwest Africa)

Purchased: 2011

Classification: HED achondrite (Eucrite)

Petrography: Highly brecciated, fine-medium grained sample. Fine grained matrix is composed of fragmented pyroxene and feldspar with three cohesive, coarse grained subophitic/gabbroic clasts. Dark grey to black melt glass pockets, often containting small fragmented clasts of pyroxene, are focused in a darker region of the sample which constitutes approximately 40% of the thin section. Accessory phases include apatite, merrillite, zircon, ilmenite and rare baddeleyite.

Geochemistry: Mineral compositions and geochemistry: Pyroxene yield bulk Fe/Mn ratios of 29.42 (N=46). Pyroxene (En₄₅Fs₄₆Wo₈; N=43) with exsolved augite lamella (En₃₅Fs₂₃Wo₄₂; N=3) occur throughout the sample. Feldspar composition averages An₈₈(N=25). Mineral chemistry measured by EMP.

Classification: Eucrite (monomict breccia)

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Tucson
Date:	P 2011
Mass (g):	31.97
Pieces:	1
Class:	Eucrite
Ferrosilite (mol%):	46.5±8.3 (N=43)
Wollastonite (mol%):	8.4± 0.9
Classifier:	L. F. White and I. Nicklin, ROM
Type spec mass (g):	6.7
Type spec location:	ROM
Main mass:	DGregory
Comments:	Sample number LM58206 in the Royal Ontario Museum collection. Formerly named DGRO 33-16.; submitted by Lee White

Institutions
and collections

ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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