Meteoritical Bulletin: Entry for Northwest Africa 7555

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Northwest Africa 7555

Basic information

Name: Northwest Africa 7555
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7555
Observed fall: No
Year found: 2012
Country: Morocco
Mass: 300 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 508 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 6 May 2013

Writeup

Writeup from MB 102:

Northwest Africa 7555 (NWA 7555)

Morocco

Purchased: 2012

Classification: HED achondrite (Eucrite)

Physical characteristics: Little remaining fusion crust with moderate iron staining; dark interior with few remnant basaltic clasts.

Petrography: Highly shocked subophitic eucrite clasts enclosed by an extensive shock melt-quenched matrix, which consists of bladed and spherulitic plagioclase (0.1 to 1.2 mm), set in fine-grained (<0.03 mm) masses of plagioclase, ilmenite, and pyroxenes.

Geochemistry: Subophitic orthopyroxene, Fs₅₃Wo_4.8(FeO/MnO = 36); plagioclase, An_91.Quenched matrix pigeonite, Fs_48.4Wo₁₄(FeO/MnO = 26); plagioclase, An_88.

Classification: Achondrite (eucrite)

Specimens: 24.5 g on deposit at PSF, DGregory hold the main mass.

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Tucson, AZ
Date:	P 2012
Mass (g):	300
Pieces:	1
Class:	Eucrite
Shock stage:	high
Weathering grade:	moderate
Ferrosilite (mol%):	53
Wollastonite (mol%):	4.8
Classifier:	T. Bunch and J. Wittke, NAU; P. Sipiera, PSF
Type spec mass (g):	24.5
Type spec location:	PSF
Main mass:	DGregory
Comments:	Submitted by Bunch

Institutions
and collections

NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015

Find references in NASA ADS:
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Geography:

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 1646 approved meteorites from Morocco (plus 23 unapproved names) (plus 1 impact crater)

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