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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
Classification
  history:
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
Writeuphelp
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:
Place of purchase:Nouadhibou, Mauritania
Date:P 2021
Mass (g):348
Pieces:1
Class:CK6-an
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
Finder:anonymous
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum f├╝r Naturkunde, Invalidenstra├če 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7885 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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