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Northwest Africa 13777 | |||||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13777 This is an OFFICIAL meteorite name. Abbreviation: NWA 13777 Observed fall: No Year found: 2021 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||||||
Classification history: |
This is the only approved meteorite classified as CK6-an. Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites | ||||||||||||||||||||||||||||||||||
Comments: | Approved 5 Jun 2021 | ||||||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 110:
Northwest Africa 13777 (NWA 13777) (Northwest Africa) Purchased: 2021 Classification: CK6-an History: The meteorite was purchased from a group of meteorites hunters in Nouadhibou, Mauritania, in early 2021. Physical characteristics: Dark-grayish rock without fusion crust. Petrography: The meteorite displays a dark-gray interior and is largely composed of fine-grained recrystallized matrix dominated by ferroan, Ni-bearing olivine. Chondrules are only rarely encountered. Less abundant phases include low-Ca pyroxene, intermediate plagioclase, and FeS. Cr-rich magnetite is abundant; metal was not detected. The meteorite contains shock melt veins. Geochemistry: olivine: Fa24.9±0.4, FeO/MnO= 85±8, NiO=0.48±0.05 wt%, n=14; low-Ca pyroxene: Fs22.9±0.2Wo0.8±0.1, FeO/MnO= 54±3, n=8; plagioclase: Ab60.6±6.6An35.9±7.6Or3.5±1.0, n=5; Cr2O3 in magnetite is about 3.3 wt%. Classification: Carbonaceous chondrite (CK6, anomalous). Anomalous designation from the unusually Fe-poor olivine. Out of 368 equilibrated CK chondrites with available olivine analyses (data from Meteoritical Bulletin Database as of March 2021), only six have similar or lower Fa content: Graves Nunataks 98102 (CK4 Fa24); NWA 5580 (CK4 Fa25.2); NWA 7615 (CK6 Fa24.7) and NWA 11207 (CK5 Fa24.9), NWA 11299 (CK5 Fa24.6), and NWA 11338 (CK4 Fa24.6-25.0). | ||||||||||||||||||||||||||||||||||
Data from: MB110 Table 0 Line 0: |
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Institutions and collections |
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011) |
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Catalogs: |
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References: | Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Photos: |
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Geography: |
Statistics: This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |