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Northwest Africa 2921
Basic information Name: Northwest Africa 2921
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2921
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 195 g
Classification
  history:
Meteoritical Bulletin:  MB 90  (2006)  CK3.8
Recommended:  R3    [explanation]

This is 1 of 36 approved meteorites classified as R3.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 3 Feb 2006
Revised 27 Jan 2020: Revised classification
Writeuphelp
Writeup from MB 109:

Northwest Africa 2921, reclassification

History: Purchased by Greg Hupé in 2005 from a Moroccan dealer.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU; T. Bunch and J. Wittke, NAU) Somewhat separated, unequilibrated chondrules (apparent diameter 560±340 µm, N = 25) are set in a finer-grained matrix (~50 vol.%, orange-brown in thin section). Accessory phases are sodic plagioclase, chromite and altered troilite.

Geochemistry: Olivine (Fa35.9±7.3, range Fa18.3-41.9, N = 11), low-Ca pyroxene (Fs29.9±0.1Wo0.5±0.0, range Fs29.8-30.0Wo0.5, N = 2), augite (Fs10.6±0.4Wo44.0±0.3, range Fs10.3-10.9Wo44.2-43.8, N = 2), plagioclase (Ab87.4±1.2An9.2±1.5Or3.4±0.6, range Ab86.3-88.7An10.9-7.9Or2.7-3.9, N = 3).

Classification: R3 chondrite.

Specimens: 20.5 g including one polished thin section at PSF; remainder with GHupé.

Data from:
  MB90
  Table 2
  Line 172:
Place of purchase:Morocco
Date:2005
Mass (g):195
Pieces:1
Class:CK3.8
Shock stage:S1
Weathering grade:W3
Fayalite (mol%):39.5 ± 1.3
Classifier:J. Wittke and T. Bunch
Type spec mass (g):20.5
Type spec location:NAU
Comments:Olv (FeO/MnO = 72–76)
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
GHupé: Gregory M. Hupé, 9003 Placid Lakes Blvd., Lake Placid, FL 33852, United States; Website (private address)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
Catalogs:
References: Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Meteorites Australia      
The Hupe Collection   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Gerald Armstrong      
jean bernard Delbauve   
Jean-Michel Masson   
METEORITES AUSTRALIA   
t.czarnecki   
Public domain photographs:
A. Irving, UWS   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7181 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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