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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:help 524 g
Meteoritical Bulletin:  MB 100  (2012)  Lodranite
Recommended:  Lodranite    [explanation]

This is 1 of 91 approved meteorites classified as Lodranite.   [show all]
Search for other: Acapulcoite-lodranite family, Lodranites, and Primitive achondrites
Comments: Approved 16 Dec 2011
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, Fs10.7, Fe/Mn=14; olivine, Fa10.8, Fe/Mn=23; Ca-pyroxene, Fs3.4En52Wo44.6; 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:
  Table 1
  Line 1481:
Place of purchase:Erfoud
Date:P 2010
Mass (g):524
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:  
   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)
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Antonello Petriccione   
Christophe PICQ      
Franco Vignato   
Michael S. Scherman   

     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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