Meteoritical Bulletin: Entry for Northwest Africa 5246

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Northwest Africa 5246

Basic information

Name: Northwest Africa 5246
This is an OFFICIAL meteorite name.
Abbreviation: NWA 5246
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass: 211 g

Classification
history:

Recommended:

CK5 [explanation]

This is 1 of 192 approved meteorites classified as CK5. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites

Comments:

Approved 19 Mar 2022

Writeup

help

Writeup from MB 111:

Northwest Africa 5246 (NWA 5246)

(Northwest Africa)

Purchased: 2007

Classification: Carbonaceous chondrite (CK5)

History: The meteorite was purchased from a local meteorite dealer in Rissani, Morocco.

Physical characteristics: Brownish rock partly covered with fusion crust.

Petrography: The meteorite displays a fresh grayish interior and is composed of large sparse, separated, and still clearly defined chondrules (apparent mean diameter about 750 µm) set in abundant recrystallized matrix. The dominating mineral phase is ferroan Ni-bearing olivine. Minor phases are intermediate plagioclase, low-Ca pyroxene, Ca-pyroxene, sulfides, and abundant Cr-rich magnetite; no metal detected. The meteorite is strongly alterated and contains abundant calcite-filled fractures.

Geochemistry: olivine: Fa_27.1±0.2(Fa_26.8-27.5, FeO/MnO=114±9; NiO=0.31±0.03 wt%, n=7); low-Ca pyroxene: Fs_23.5±0.3Wo_0.8±0.1(Fs_23.1-23.8Wo_0.7-0.9, n=5); Ca-pyroxene: Fs_9.2±0.7Wo_47.0±0.7(Fs_8.4-10.5Wo_46.3-47.9, n=5); feldspar: An_46.8-64.5Ab_34.5-51.4Or_1.0-1.8, n=5; magnetite contains 4.0±0.2 wt% Cr₂O₃, n=3

Data from:
  MB111
  Table 0
  Line 0:

Place of purchase:	Rissani, Morocco
Date:	P 2007
Mass (g):	211
Pieces:	1
Class:	CK5
Shock stage:	S2
Weathering grade:	high
Fayalite (mol%):	27.1
Ferrosilite (mol%):	23.5; 9.2
Wollastonite (mol%):	0.8; 47.0
Classifier:	A. Greshake, MNB
Type spec mass (g):	20.6
Type spec location:	MNB
Main mass:	Stefan Ralew
Comments:	Submitted by Ansgar Greshake

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 111, in preparation (2022)

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Mirko Graul	Photo added 19 Apr 2022

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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