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| Northwest Africa 8331 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 8331 This is an OFFICIAL meteorite name. Abbreviation: NWA 8331 Observed fall: No Year found: 2002 Country: Morocco Mass:  43 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 53 approved meteorites classified as CVox3. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites | ||||||||||||||||||||||||||||||
| Comments: |
Approved 24 Mar 2014 Revised 28 Mar 2024: Revised class based on metbull text | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 103:
Northwest Africa 8331 (NWA 8331) Morocco 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: MB103 Table 0 Line 0: |
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| Plots: | O isotopes: | ||||||||||||||||||||||||||||||
| Institutions and collections |
CEREGE: CEREGE
BP 80
Avenue Philibert, Technopole de l'Arbois
13545 Aix-en-Provence Cedex 4
France, France (institutional address; updated 10 Jun 2023) |
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| Catalogs: |
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| 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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Geography:
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Statistics: This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||
| Also see: |
This lists the most popular meteorites among people who looked up this meteorite.
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| Revision history: |
This lists important revisions made to data for this record.
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