Meteoritical Bulletin: Entry for Northwest Africa 13777

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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: 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

Writeup

help

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: Fa_24.9±0.4, FeO/MnO= 85±8, NiO=0.48±0.05 wt%, n=14; low-Ca pyroxene: Fs_22.9±0.2Wo_0.8±0.1, FeO/MnO= 54±3, n=8; plagioclase: Ab_60.6±6.6An_35.9±7.6Or_3.5±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 Fa_25.2); NWA 7615 (CK6 Fa_24.7) and NWA 11207 (CK5 Fa_24.9), NWA 11299 (CK5 Fa_24.6), and NWA 11338 (CK4 Fa_24.6-25.0).

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 für Naturkunde, Invalidenstraße 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:
Find references in Google Scholar:

Photos:

Credit	Photos
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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