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Northwest Africa 10993
Basic information Name: Northwest Africa 10993
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10993
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 196.7 g
Meteoritical Bulletin:  MB 106  (2018)  CV3
MB 113  (2024)  CVred3
Recommended:  CVred3    [explanation]

This is 1 of 49 approved meteorites classified as CVred3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 9 Jan 2017
Revised 27 Mar 2024: Revised class based on metbull text
Writeup from MB 106:

Northwest Africa 10993 (NWA 10993)

(Northwest Africa)

Purchased: 2015

Classification: Carbonaceous chondrite (CV3)

History: Purchased by Jay Piatek in Morocco, 2015.

Physical characteristics: Fresh black fusion crust. A saw-cut surface reveals chondrules, CAIs, and scattered metal grains set in a light green-gray groundmass.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows distinct chondrules, many of them porphyritic, abundant Fe-Ni metal and Fe-sulfide in a fine-grained matrix, the matrix makes up about 50% of this meteorite. Diopside and Al-diopside were observed.

Geochemistry: (C. Agee and N. Muttik, UNM) Olivine Fa30.7±15.1, Fe/Mn=130±37, Cr2O3=0.11±.14 (wt), NiO=0.03±0.04 (wt), n=50; enstatite Fs3.4±2.5Wo1.2±1.0, Fe/Mn=26±12, n=17. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave an average composition δ17O=-4.34, δ18O=0.17, Δ17O=-4.44 (linearized, all per mil, TFL slope=0.528).

Classification: Carbonaceous chondrite CV3 (reduced subgroup). Possibly paired with NWA 723.

Specimens: 20.9 g including a probe mount on deposit at UNM, Jay Piatek holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2015
Mass (g):196.7
Shock stage:low
Weathering grade:low
Fayalite (mol%):30.7±15.1
Ferrosilite (mol%):3.4±2.5
Wollastonite (mol%):1.2±1.0
Classifier:C. Agee, UNM
Type spec mass (g):20.9
Type spec location:UNM
Main mass:Jay Piatek
Comments:Fieldname JP-23; submitted by C. Agee
Plots: O isotopes:  
   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)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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