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Northwest Africa 8331
Basic information Name: Northwest Africa 8331
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8331
Observed fall: No
Year found: 2002
Country: Morocco
Mass:help 43 g
Meteoritical Bulletin:  MB 103  (2014)  CV3
Recommended:  CV3    [explanation]

This is 1 of 612 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 24 Mar 2014
Writeup from MB 103:

Northwest Africa 8331 (NWA 8331)


Purchased: 2002

Classification: Carbonaceous chondrite (CV3)

History: The meteorite was bought in 2002 in Sainte-Marie-aux-Mines, France, from a Moroccan dealer

Physical characteristics: A single dark stone without fusion crust. Cut face display abundant orange and brownish chondrules in a dark brown matrix.

Petrography: (J. Gattacceca, B. Devouard, CEREGE) Chondrule mean apparent size 934±914 μm (N=57), up to 6 mm. Most chondrules are surrounded by fine-grained dark rims. Modal abundances by point counting: 45 vol% chondrules, 40 vol% matrix, 13 vol% opaques. Opaques consist mostly of troilite (11 vol%), both in matrix and chondrules, in grains up to 500 μm. Metal is very scarce. Magnetic measurements (hysteresis) indicate the presence of about 5 wt% magnetite, present as fine grains in the matrix. Rare refractory inclusions up to 1 mm.

Geochemistry: Chondrule olivine Fa6.4±5.2, PMD 62%, range 0.7-20.5, mean FeO/MnO=53, mean NiO 0.08 wt.%, N=19. Cr2O3 in ferroan olivine 0.18±0.11 wt.% (N=13). Matrix olivine Fa~56. Orthopyroxene Fs1.7±0.6Wo1.0±0.4, PMD 36%, mean NiO 0.15 wt.%, N=10. FeNi metal Ni=60 wt.% (N=2). Oxygen isotopic compositions: (J. Gattacceca and C. Sonzogni, CEREGE) analysis of four 1.5 mg acid-washed chondrule samples (from two different chondrules) by laser fluorination gave δ17O = -5.67, -5.54, -3.71, -3.48; δ18O = -1.50, -1.34, -0.36, 0.11; Δ17O = -4.89, -4.84, -3.52, -3.53 (all per mil). Magnetic susceptibility log χ = 4.36 (c in 10-9 m3/kg).

Classification: Carbonaceous chondrite (CV3), oxidized subgroup.

Specimens: 8.7 g and a polished section at CEREGE. Main mass with N. Tourment.

Data from:
  Table 0
  Line 0:
Place of purchase:Sainte-Marie-aux-Mines, France
Date:P 2002
Mass (g):43
Weathering grade:high
Fayalite (mol%):6.4±5.2 (PMD=62%, N=19)
Ferrosilite (mol%):1.7±0.6 (N=10)
Wollastonite (mol%):1.0±0.4 (N=10)
Magnetic suscept.:4.36
Classifier:J. Gattacceca, B. Devouard, CEREGE
Type spec mass (g):8.7
Type spec location:CEREGE
Main mass:N. Tourment
Comments:Submitted by J. Gattacceca
Plots: O isotopes:  
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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     This is 1 of 1973 approved meteorites from Morocco (plus 37 unapproved names) (plus 1 impact crater)

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