Meteoritical Bulletin: Entry for Northwest Africa 5263

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Northwest Africa 5263

Basic information

Name: Northwest Africa 5263
This is an OFFICIAL meteorite name.
Abbreviation: NWA 5263
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass: 520 g

Classification
history:

Recommended:

R3-6 [explanation]

This is 1 of 30 approved meteorites classified as R3-6. [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)

Comments:

Approved 19 Mar 2022

Writeup

help

Writeup from MB 111:

Northwest Africa 5263 (NWA 5263)

(Northwest Africa)

Purchased: 2005

Classification: Rumuruti chondrite (R3-6)

History: The meteorite was purchased from a Morrocan meteorite dealer on the meteorite fair in Ensisheim, France.

Physical characteristics: Three brownish fragments without fusion crust.

Petrography: The meteorite displays a brownish to orange interior and is composed of up to 1 cm sized type 6 and black impact melt clasts set in type 3 matrix. Fe-rich olivine is the predominant mineral phase in the type 6 clasts. In the matrix, olivine and low-Ca pyroxene are mostly compositionally unequilibrated. Chondrules have an average diameter of about 450 μm. More minor phases include low-Ca pyroxene, Ca-pyroxene, sodic plagioclase, sulfides, and chromite; no metal has been detected.

Geochemistry: type 3 lithology: olivine: Fa_25.5±11.1(Fa_14.1-43.5, n=24); low-Ca pyroxene: Fs_12.1±7.7Wo_0.8±0.8(Fs_1.0-27.3Wo_0.2-2.7, n=19); type 6 lithology: olivine: Fa_37.4±0.3(Fa_36.9-37.8, n=12); Ca-pyroxene: Fs_11.7±0.6Wo_40.2±1.9(Fs_10.9-12.7Wo_35.9-42.9, n=8); feldspar: An_9.8-13.0Ab_85.2-89.4Or_0.5-1.8, n=6

Data from:
  MB111
  Table 0
  Line 0:

Place of purchase:	Ensisheim, France
Date:	P 2005
Mass (g):	520
Pieces:	3
Class:	R3-6
Shock stage:	S4
Weathering grade:	W3
Fayalite (mol%):	25.5; 37.4
Ferrosilite (mol%):	12.1; 11.7
Wollastonite (mol%):	0.8; 40.2
Classifier:	A. Greshake, MNB
Type spec mass (g):	23
Type spec location:	MNB
Main mass:	Christian Anger
Comments:	Submitted by Ansgar Greshake

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Anger: Christian Anger, Korngasse 6, 2405 Bad Deutsch-Altenburg, Austria; Website (private address)

Catalogs:

References:

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

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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