Meteoritical Bulletin: Entry for Northwest Africa 6685

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Northwest Africa 6685

Basic information

Name: Northwest Africa 6685
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6685
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass: 524 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	Lodranite
Recommended:			Lodranite [explanation]

This is 1 of 93 approved meteorites classified as Lodranite. [show all]
Search for other: Acapulcoite-lodranite family, Lodranites, and Primitive achondrites

Comments:

Approved 16 Dec 2011

Writeup

help

Writeup from MB 100:

Northwest Africa 6685 (NWA 6685)

(Northwest Africa)

Purchased: 2010

Classification: Primitive achondrite (Lodranite)

History: Purchased by Giorgio Tomelleri from a dealer in Erfoud, Morocco.

Physical characteristics: A complete stone weighing 524 g, with fusion crust.

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali MSP). The thin section is dominated by large olivine and subordinate orthopyroxene phenocrysts (to 8 mm) embedded in an interstitial fine-grained matrix of the same phases. The matrix grains range from 0.01 to 0.1 mm. Plagioclase is absent. Opaques consist of kamacite and troilite, frequently altered to iron oxides.

Geochemistry: Orthopyroxene, Fs_10.7, Fe/Mn=14; olivine, Fa_10.8, Fe/Mn=23; Ca-pyroxene, Fs_3.4En₅₂Wo_44.6; Cr in troilite=0.60 wt%; Oxygen isotopes (I.Franchi, R.Greenwood, OU): δ¹⁷O = 0.10; δ¹⁸O = 2.50; Δ¹⁷O = -1.2 per mil.

Classification: Achondrite (lodranite). Highly weathered. Moderately shock.

Specimens: 23.4 g is on deposit at MSP (MSP 5151).

Data from:
  MB100
  Table 1
  Line 1481:

Place of purchase:	Erfoud
Date:	P 2010
Mass (g):	524
Pieces:	2
Class:	Lodranite
Fayalite (mol%):	11
Ferrosilite (mol%):	11
Wollastonite (mol%):	1.9
Classifier:	V.Moggi Cecchi, G. Pratesi, S. Caporali, MSP
Type spec mass (g):	23.4
Type spec location:	MSP
Main mass:	Unknown
Comments:	Submitted by Vanni Moggi Cecchi

Plots:

O isotopes:

Institutions
and collections

MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 22 Oct 2022)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Antonello Petriccione
Christophe PICQ
Franco Vignato
Michael S. Scherman

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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