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Northwest Africa 13777
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:help 348 g
Recommended:  CK6-an    [explanation]

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 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:
  Table 0
  Line 0:
Place of purchase:Nouadhibou, Mauritania
Date:P 2021
Mass (g):348
Shock stage:S3
Weathering grade:moderate
Fayalite (mol%):24.9
Ferrosilite (mol%):22.9
Wollastonite (mol%):0.8
Magnetic suscept.:4.73
Classifier:A. Greshake, MNB
Type spec mass (g):28.2
Type spec location:MNB
Main mass:Salamu Ali
Comments:Submitted by Ansgar Greshake
   and collections
MNB: Museum f├╝r Naturkunde, Invalidenstra├če 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
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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Public domain photographs:
Ansgar Greshake   

     This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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