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Northwest Africa 7655
Basic information Name: Northwest Africa 7655
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7655
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 250 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  CR2
Recommended:  CR2    [explanation]

This is 1 of 162 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Comments: Approved 5 Feb 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7655 (NWA 7655)

Morocco

Purchased: Aug 2012

Classification: Carbonaceous chondrite (CR2)

History: Purchased by Adam Bates from a meteorite dealer in Morocco, August 2012.

Physical characteristics: Single stone with dark weathered irregular surface with chondrules visible through desert patina. Saw cut reveals many chondrules of variable size, some armored with metal/sulfide, scattered metal spherules, set in a dark reddish brown matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous porphyritic chondrules some up to 3 mm, in a fine-grained, sulfide- and metal-rich, matrix. Many chondrules contain igneous kamacite spheres, and some of the larger chondrules are rimmed with metal/sulfide. Spherical, metal-rimmed, 3 mm CAI with spinel, anorthite, and forsterite present.

Geochemistry: (C. Agee and M. Spilde, UNM) Ferroan olivine Fa6.8±8.3, range Fa2.1-25.4, Fe/Mn=25±16, Cr2O3=0.60±0.11, CaO=0.19±0.05 wt%, n=13; Type I chondrule olivine Fa1.3±0.3, Cr2O3=0.38±0.11, CaO=0.37±0.14 wt%, n=15; low-Ca pyroxene Fs2.6±1.2Wo0.9±0.9, Fe/Mn=15±5, n=25; fassaite Fs2.1±1.6Wo43.1±4.8, Al2O3=7.48±1.10 wt%.

Classification: Carbonaceous chondrite (CR2)

Specimens: 23 g including a probe mount on deposit at UNM, Adam Bates holds the main mass.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P Aug 2012
Mass (g):250
Pieces:1
Class:CR2
Fayalite (mol%):1.3-25.4
Ferrosilite (mol%):2.6±1.2
Wollastonite (mol%):0.9±0.9
Classifier:C. Agee, UNM
Type spec mass (g):23
Type spec location:UNM
Main mass:Adam Bates
Comments:Submitted by C. Agee
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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 1374 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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