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Northwest Africa 7027
Basic information Name: Northwest Africa 7027
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7027
Observed fall: No
Year found: 2010
Country: Morocco
Mass:help 16 kg
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  CO3.1
Recommended:  CO3.1    [explanation]

This is 1 of 13 approved meteorites classified as CO3.1.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 12 Sep 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7027 (NWA 7027)

Morocco

Purchased: 2010

Classification: Carbonaceous chondrite (CO3.1)

History: Purchased by Blaine Reed in September, 2010.

Physical characteristics: Single stone, dark brown weathered fusion crust, saw-cut reveals many small chondrules in a fine-grained, dark brown matrix.

Petrography: Microprobe examination of a polished mount shows numerous porphyritic chondrules many ~100 μm in diameter with range of ~50-500 μm. Glassy chondrule mesostasis, and ubiquitous opaque grain boundary matrix, sulfide-rich, also some irregularly shaped chondrules.

Geochemistry: (C. Agee and L. Burkemper, UNM) Random chondrule olivine range Fa0.5-38.1, mean=Fa11.5, n=35, chondrule ferroan olivine mean Fa17.1±12.5, Cr2O3=0.20±0.11 wt%, Fe/Mn=88±71, n=23; enstatite Fs3.5±2.1Wo2.0±2.0, n=8; aluminous diopside Fs2.7±1.9Wo53.9±5.8, Al2O3=13.43±6.23 wt%.

Classification: Carbonaceous chondrite (CO3.1) based on mean Cr2O3=0.20±0.11 wt% in chondrule ferroan olivines which is approximately midway between Colony CO3.0 (Cr2O3=0.36±0.10 wt%) and Rainbow CO3.2 (Cr2O3=0.08±0.05 wt%), Grossman and Brearley (2005).

Specimens: 40 g including a probe mount on deposit at UNM, 24.1 g at PSF, Blaine Reed holds the main mass.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Denver
Date:P 2010
Mass (g):15997
Pieces:1
Class:CO3.1
Fayalite (mol%):0.5-38.1
Ferrosilite (mol%):3.5±2.1
Wollastonite (mol%):2.0±2.0
Classifier:C. Agee, UNM
Type spec mass (g):40; 24.1
Type spec location:UNM ; PSF
Main mass:Blaine Reed
Comments:Submitted by C. Agee
Institutions
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (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 1417 approved meteorites from Morocco (plus 15 unapproved names) (plus 1 impact crater)

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