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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:help 300 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 431 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 6 May 2013
Writeuphelp
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, Fs53Wo4.8 (FeO/MnO = 36); plagioclase, An91. Quenched matrix pigeonite, Fs48.4Wo14 (FeO/MnO = 26); plagioclase, An88.

Classification: Achondrite (eucrite)

Specimens: 24.5 g on deposit at PSF, Gregory 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:D. Gregory
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)
Gregory: 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:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1390 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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