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Northwest Africa 7550
Basic information Name: Northwest Africa 7550
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7550
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 225 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  CK4
Recommended:  CK4    [explanation]

This is 1 of 105 approved meteorites classified as CK4.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 6 May 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7550 (NWA 7550)

Morocco

Purchased: 2012

Classification: Carbonaceous chondrite (CK4)

Physical characteristics: Moderately fresh fusion crust with friable white to gray interior.

Petrography: Well-defined chondrules.

Geochemistry: Olivine, Fa33.1 (FeO/MnO = 95); orthopyroxene, Fs24.7Wo 2.1; magnetite Cr2O3 = 4.1 wt %.

Classification: CK4

Specimens: A total of 21 g are at PSF, Gregory holds the main mass

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Tucson, AZ
Date:P 2012
Mass (g):225
Pieces:1
Class:CK4
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):33.1
Ferrosilite (mol%):24.7
Wollastonite (mol%):2.1
Classifier:T. Bunch and J. Wittke, NAU; P. Sipiera, PSF
Type spec mass (g):21
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 1402 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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