Meteoritical Bulletin: Entry for Northwest Africa 6830

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Northwest Africa 6830

Basic information

Name: Northwest Africa 6830
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6830
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass: 730 g

Classification
history:

Recommended:

Diogenite [explanation]

This is 1 of 432 approved meteorites classified as Diogenite. [show all]
Search for other: Achondrites, Diogenites, and HED achondrites

Comments:

Approved 10 Mar 2019

Writeup

Writeup from MB 108:

Northwest Africa 6830 (NWA 6830)

(Northwest Africa)

Purchased: 2009

Classification: HED achondrite (Diogenite)

History: The meteorite was purchased in 2009 from a local meteorite dealer in Erfoud, Morocco.

Physical characteristics: Five greyish fragmentsl with some fusion crust.

Petrography: Orthopyroxenite predominantly composed of blocky up to 1 mm sized orthopyroxenes grains, few olivines, and interstitial plagioclase. Minor phases include silica, troilite, and metallic iron.

Geochemistry: orthopyroxene: Fs_24.9±0.3Wo_2.2±0.2(Fs_24.4-25.6Wo_1.7-2.6, n=30, FeO/MnO=25-29); FeO/MnO in olivine: 37-42; calcic plagioclase: An_78.5±6.2(An_66.5-84.8, n=22)

Classification: diogenite (olivine-bearing)

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Erfoud, Morocco
Date:	P 2009
Mass (g):	730
Pieces:	5
Class:	Diogenite
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	29.6±0.2 (n=20)
Ferrosilite (mol%):	24.9
Wollastonite (mol%):	2.2
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)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108, in preparation (2019)

Find references in NASA ADS:
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Photos:

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

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7005 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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