header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 16 Nov 2019
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Northwest Africa 6690
Basic information Name: Northwest Africa 6690
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6690
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 88.3 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Diogenite
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 16 Dec 2011
Writeuphelp
Writeup from MB 100:

Northwest Africa 6690 (NWA 6690)

(Northwest Africa)

Purchased: 2010

Classification: HED achondrite (Diogenite)

History: Found by an anonymous person in Western Sahara and purchased 2010 in Erfoud by G. Tomelleri.

Physical characteristics: A single stone of 88.3 g, with no fusion crust.

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali MSP): A monomict coarse-grained orthopyroxenite dominated by orthopyroxene, with subordinate plagioclase and clinopyroxene. Opaque phases are represented by ilmenite and Ti-chromite.

Geochemistry: Low-Ca pyroxene (Fs31-38Wo2-3); augite Fs13Wo44; calcic plagioclase (An86-93), Mg-rich ilmenite (MgO 0.73-0.98 wt%); Ti-rich chromite [Cr/(Cr+Al) = 0.89; Ti = 3.2 wt.%, Mg = 3.0 wt.%]; Oxygen isotopes: (I. Franchi, R. Greenwood, OU) δ17O = 1.94, δ18O = 4.19, Δ17O = -0.24 per mil.

Classification: Achondrite (diogenite) with moderate degree of shock and low degree of weathering.

Specimens: 18.0 g and one thin section are on deposit at MSP (MSP 5156).

Data from:
  MB100
  Table 1
  Line 1486:
Place of purchase:Erfoud
Date:P 2010
Mass (g):88.3
Pieces:2
Class:Diogenite
Ferrosilite (mol%):31-38
Wollastonite (mol%):2-3
Classifier:V. Moggi Cecchi, G. Pratesi, S. Caporali, MSP
Type spec mass (g):18
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 5 Mar 2014)
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)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Antonello Petriccione      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7009 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

Direct link to this page