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Northwest Africa 10891
Basic information Name: Northwest Africa 10891
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10891
Observed fall: No
Year found: 2016
Country: Mauritania
Mass:help 482 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  CO3.2
Recommended:  CO3.2    [explanation]

This is 1 of 13 approved meteorites classified as CO3.2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 18 Nov 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10891 (NWA 10891)

Mauritania

Purchased: April 2016

Classification: Carbonaceous chondrite (CO3.2)

History: Found by meteorite hunters during an expedition near the Western Saharan, Algerian and Mauritanian border region. Purchased in Mauritania.

Physical characteristics: Single stone. Weathered fusion crust exterior. A saw cut reveals many very small chondrules and a few small CAIs set in a dark brown matrix.

Petrography: : (C. Agee, UNM) Microprobe examination of a polished mount shows numerous chondrules, many fragmental or irregular, most in the size range 50-200 μm. Scattered matrix olivines and CAIs were observed throughout. Fine grained matrix makes up approximately 40% of this meteorite.

Geochemistry: (C. Agee and M. Spilde, UNM) All olivine Fa15.8±15.5, n=19; coarse ferroan olivine Fa19.7±15.2, Fe/Mn=90±39, Cr2O3=0.09±0.09 (wt%), n=15; enstatite Fs1.9±1.3Wo2.0±1.4, n=8; diopside Fs4.1±0.1Wo38.1±6.6, n=2.

Classification: Carbonaceous chondrite (CO3.2), type 3.2 based on mean value and sigma of Cr2O3 in ferroan olivine (Grossman and Brearley, 2005), the values are similar to Rainbow (CO3.2).

Specimens: 20.6 g including a probe mount on deposit at UNM. DPitt 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:
  MB105
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P April 2016
Mass (g):482.3
Pieces:1
Class:CO3.2
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):15.8±15.5
Ferrosilite (mol%):1.9±1.3, 4.1±0.1
Wollastonite (mol%):2.0±1.4, 38.1±6.6
Classifier:C. Agee, UNM
Type spec mass (g):20.6
Type spec location:UNM
Main mass:DPitt
Comments:Field name MVCH73; submitted by C. Agee, UNM
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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 103 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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