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Northwest Africa 7921
Basic information Name: Northwest Africa 7921
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7921
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 704 g
Meteoritical Bulletin:  MB 102  (2013)  CV3
Recommended:  CV3    [explanation]

This is 1 of 624 approved meteorites (plus 1 unapproved name) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 27 Jul 2013
Writeup from MB 102:

Northwest Africa 7921 (NWA 7921)


Purchased: 2012

Classification: Carbonaceous chondrite (CV3)

History: Purchased by Brahim Tahiri from a Moroccan hunter and sent to his partner Sean Tutorow for classification, 2012.

Physical characteristics: Consists of 14 individual stones or fragments, several fit together. Dark irregular exterior, some weathered fusion crust, chondrules visible through desert patina, saw-cut reveals densely packed chondrules of variable size, many 1-2 mm, CAIs present.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount showed a sharp boundary between a large CAI and host matrix + chondrules. Matrix is very fine-grained with numerous porphyritic chondrules, accessory augite, diopside, aluminous diopside, and anorthite. Large CAI is approximately 95% gehlenite, with accessory spinel, hercynite-spinel, CaTiO3-perovskite, calcium carbonate, and Fe,Ni-metal.

Geochemistry: (C. Agee and L. Burkemper, UNM) Olivine range Fa0.7-12.4, n=31, mean value ferroan olivine Fa5.3±2.7, Fe/Mn=53±28, Cr2O3=0.09±0.07wt%, n=22; type I chondrule olivine Fa1.2±0.3, n=9; low-Ca pyroxene range Fs0.8-15.1, mean value Fs2.6±3.1Wo1.4±1.0, Fe/Mn=16±10, n=22. (Karen Ziegler, UNM) Oxygen isotope mean values of 3 analyses on 3 acid-washed aliquots of matrix + chondrules, 1.1, 1.1, 1.7 mg, gave δ17O= -4.671, -3.451, -5.223, δ18O= -0.661, +0.453, -0.306, Δ17O= -4.322, -3.690, -5.061 (all per mil).

Classification: Carbonceous chondrite (CV3), oxygen isotopes on CCAM, in CV3 field.

Specimens: 21.4 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2012
Mass (g):704.19
Fayalite (mol%):0.7-12.4
Ferrosilite (mol%):0.8-15.1
Classifier:C. Agee, UNM
Type spec mass (g):21.4
Type spec location:UNM
Main mass:Sean Tutorow
Comments:Field name G-383; 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 Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Michael S. Scherman   


     This is 1 of 2012 approved meteorites from Morocco (plus 35 unapproved names) (plus 1 impact crater)

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