header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 10 Jul 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 6721
Basic information Name: Northwest Africa 6721
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6721
Observed fall: No
Year found: 2011
Country: Morocco
Mass:help 181 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Lunar (feldsp. breccia) 
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 172 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 18 Jul 2011
Revised 29 Jan 2012: Small mods to mass and pieces
Writeuphelp
Writeup from MB 100:

Northwest Africa 6721 (NWA 6721)

Morocco

Found: 2010 Nov

Classification: Lunar meteorite (feldspathic breccia)

History: Multiple stones were found together on Hamada du Drâa, Morocco, in late 2010 and purchased by Jack Schrader in April 2010 from a dealer in Taliouine, Morocco.

Physical characteristics: A total of 16 dark gray, uncrusted stones (combined weight 181 g) containing small white clasts.

Petrography: (A. Irving and S. Kuehner, UWS) A fine grained, heterogeneous, fragmental breccia composed of mineral clasts and ophitic-textured lithic clasts. Mineral clasts include anorthitic plagioclase, orthopyroxene, subcalcic augite, pigeonite, olivine (some very fayalitic), sparse intergrowths of hedenbergite+fayalite+silica (after former pyroxferroite), ilmenite, irregular kamacite grains and troilite.

Geochemistry: Pigeonite (Fs21.6-27.8Wo5.9-12.4, FeO/MnO=49-58), orthopyroxene (Fs32.3Wo3.1, FeO/MnO=61), subcalcic augite (Fs18.2-29.8Wo33.2-27.9, FeO/MnO=42-47), olivine (Fa52.2-85.5, FeO/MnO=90-100), plagioclase (An95.9-97.9Or0.1-0.2). Bulk composition (R. Korotev, WUSL): FeO 5.0 wt%, La 3.5 ppm, Sm 1.6 ppm, Yb 1.25 ppm, Th 0.60 ppm.

Classification: Achondrite (lunar, feldspathic breccia).

Specimens: A total of 20.2 g of sample (3 stones) are on deposit at UWS. The main masses are held by J. Schrader.

Data from:
  MB100
  Table 1
  Line 1496:
Origin or pseudonym:Hamada du Drâa
Place of purchase:Taliouine
Date:2010 Nov
Mass (g):181
Pieces:16
Class:Lunar (feldsp. breccia)
Shock stage:low
Weathering grade:low
Fayalite (mol%):52.2-85.5
Ferrosilite (mol%):21.6-27.8; 32.3; 18.2-29.8
Wollastonite (mol%):5.9-12.4; 3.1; 33.2-27.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.2
Type spec location:UWS
Main mass:Schrader
Comments:Submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1374 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

Direct link to this page