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Northwest Africa 12917 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12917 This is an OFFICIAL meteorite name. Abbreviation: NWA 12917 Observed fall: No Year found: 2019 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 622 approved meteorites classified as CM2. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 20 Oct 2019 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 108:
Northwest Africa 12917 (NWA 12917) (Northwest Africa) Purchased: 19 mar 2019 Classification: Carbonaceous chondrite (CM2) History: Purchased by Carlos Muñecas in 19 mar 2019 from a nomad in Guelmin, Morocco Physical characteristics: Almost black individuals partly covered with fusion crust. Friable. Petrography: Porous aggregate of chondrules with an apparent diameter of 0.2-2 mm (N=11) and often surrounded by fine-grained accretionary rims plus tiny mafic silicate grains (olivine and pyroxene) occur in an extremely fine-grained black matrix containing magnetite, sulfides and phyllosilicates (75-80 vol% by point counting). Geochemistry: Mineral compositions and geochemistry: Mean values of defocused matrix analyses (all wt%; N=10): SiO2: 28.1, TiO2: 0.12; Na2O: 0.09; Cr2O3: 0.63, MgO: 18.2, MnO: 0.16, CaO: 0.15, FeO: 22.6, Al2O3: 1.98, NiO: 0.82, P2O5: 0.02, S: 0.65, Total: 73.5. Olivine Fa1.2-45.4, Cr2O3=0.22-0.49 (N=8). Low-Ca pyroxene Fs0.9-6.7Wo3.0-4.3 (N=4). Classification: Carbonaceous chondrite (CM2) | ||||||||||||||||||||||||||||||
Data from: MB108 Table 0 Line 0: |
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Institutions and collections |
UPC: Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya
Diagonal 647, ed. ETSEIB, 08028 Barcelona, Spain, Spain (institutional address; updated 3 May 2015) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Photos: |
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Geography: |
Statistics: This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names) |