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Northwest Africa 10208
Basic information Name: Northwest Africa 10208
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10208
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 400 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  CO3
Recommended:  CO3    [explanation]

This is 1 of 523 approved meteorites classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 18 Jul 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 10208 (NWA 10208)

(Northwest Aftica)

Purchased: 2015

Classification: Carbonaceous chondrite (CO3)

History: Purchased by Adam Aaronson in Morocco, 2015.

Physical characteristics: Weathered exterior. A saw cut reveals very small chondrules in a very fine-grained, dark brown groundmass.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous chondrules with apparent mean diameter 200±175 μm, n=40. Fine-grained matrix makes up about 40% of this meteorite. Kamacite, taenite, troilite, iron oxide, and phosphate were detected.

Geochemistry: (C. Agee and N. Muttik, UNM) Olivine Fa24.6±15.4, Fe/Mn=97±39, Cr2O3=0.15±0.18 (wt%), n=30; low-Ca pyroxene Fs2.5±0.9Wo2.1±1.9, Fe/Mn=27±13, n=13.

Classification: Carbonaceous chondrite (CO3), subtype estimated between 3.0 and 3.2 based on Cr2O3 content of ferroan olivine, however the 1-sigma value of 0.18 is significantly higher than the trend for CO chondrites in figure 15 of Grossman and Brearley (2005).

Specimens: 20.1 g including a probe mount on deposit at UNM; Aaronson 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:
  MB104
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2015
Mass (g):400
Pieces:1
Class:CO3
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):24.6±15.4
Ferrosilite (mol%):2.5±0.9
Wollastonite (mol%):2.1±1.9
Classifier:C. Agee, UNM
Type spec mass (g):20.2
Type spec location:UNM
Main mass:Aaronson
Comments:M1827; 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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7027 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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