Meteoritical Bulletin: Entry for Northwest Africa 5670

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Northwest Africa 5670

Basic information

Name: Northwest Africa 5670
This is an OFFICIAL meteorite name.
Abbreviation: NWA 5670
Observed fall: No
Year found: 2008
Country: (Northwest Africa)
Mass: 179 g

Classification
history:

Recommended:

R5-6 [explanation]

This is 1 of 2 approved meteorites classified as R5-6. [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)

Comments:

Approved 20 Dec 2021

Writeup

Writeup from MB 110:

Northwest Africa 5670 (NWA 5670)

(Northwest Africa)

Purchased: 2008

Classification: Rumuruti chondrite (R5-6)

History: The meteorite was purchased from a meteorite dealer on a mineral fair in Berlin, Germany.

Physical characteristics: Brownish rock without fusion crust.

Petrography: The meteorite shows a light orange interior and is a breccia composed of up to 1.7 cm sized type 6 and black melt rock clasts in abundant type 5 host lithology that contains some weakly delineated chondrules. Ferroan olivine, Ca-pyroxene, and sodic plagioclase are the dominant mineral phases. Opaques are pentlandite, pyrrhotite and Ti-bearing chromite; metal is absent.

Geochemistry: olivine: Fa_37.7±0.2(Fa_37.4-37.9, FeO/MnO=77±5, n=12); low-Ca pyroxene: Fs_29.4±0.2Wo_1.8±0.2(Fs_29.0-29.9Wo_1.5-2.1, n=10); Ca-pyroxene: Fs_11.4±0.6Wo_44.7±0.7, (Fs_9.8-11.8Wo_44.1-46.5, n=10); feldspar: An_6.9-13.2Ab_82.7-87.3Or_2.9-5.8, n=10

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Berlin, Germany
Date:	P 2008
Mass (g):	179
Pieces:	1
Class:	R5-6
Shock stage:	moderate
Weathering grade:	low
Fayalite (mol%):	37.7
Ferrosilite (mol%):	29.4; 11.4
Wollastonite (mol%):	1.8; 44.7
Classifier:	A. Greshake, MNB
Type spec mass (g):	20.4
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. 110, in preparation (2021)

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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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