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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 58 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 Photo added 19 Apr 2022
Photo added 19 Apr 2022
jean bernard Delbauve   
Jean-Michel Masson Photo added 19 Apr 2022
METEORITES AUSTRALIA Photo added 19 Apr 2022
t.czarnecki   
Public domain photographs:
A. Irving, UWS   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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