Meteoritical Bulletin: Entry for Northwest Africa 6825

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Northwest Africa 6825

Basic information

Name: Northwest Africa 6825
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6825
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass: 820 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	R5
Recommended:			R5 [explanation]

This is 1 of 38 approved meteorites classified as R5. [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)

Comments:

Approved 20 Oct 2019

Writeup

Writeup from MB 108:

Northwest Africa 6825 (NWA 6825)

(Northwest Africa)

Purchased: 2010

Classification: Rumuruti chondrite (R5)

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

Physical characteristics: Fourteen dark greyish fragments partly covered with fusion crust.

Petrography: The meteorite is a R-type breccia composed of up to 1 cm sized angular to subrounded clasts set into a more fine-grained greyish clastic matrix. Chondrules are well preserved and have an average apparent mean diameter of about 400 μm. Fe-rich olivine is the dominant mineral in clasts and matrix. More minor phases include low-Ca pyroxene, augite, pentlandite, and sodic plagioclase; no metal has been detected. The meteorite contains shock melt veins.

Geochemistry: olivine: Fa_37.7±0.2(n=18, FeO/MnO=82±5); low-Ca pyroxene: Fs_29.6±0.3Wo_1.7±0.2, n=4; Ca-pyroxene: Fs_11.2±0.4Wo_45.0±0.6, n=10

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Erfoud, Morocco
Date:	P 2010
Mass (g):	820
Pieces:	14
Class:	R5
Shock stage:	S4
Weathering grade:	W1
Fayalite (mol%):	37.7
Ferrosilite (mol%):	29.6; 11.2
Wollastonite (mol%):	1.7; 45.0
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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
DCOM

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9092 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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