Meteoritical Bulletin: Entry for Northwest Africa 2921

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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: 195 g

Classification
history:

Meteoritical Bulletin:	MB 90	(2006)	CK3.8
Recommended:			R3 [explanation]

This is 1 of 70 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

Writeup

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 (Fa_35.9±7.3, range Fa_18.3-41.9, N = 11), low-Ca pyroxene (Fs_29.9±0.1Wo_0.5±0.0, range Fs_29.8-30.0Wo_0.5, N = 2), augite (Fs_10.6±0.4Wo_44.0±0.3, range Fs_10.3-10.9Wo_44.2-43.8, N = 2), plagioclase (Ab_87.4±1.2An_9.2±1.5Or_3.4±0.6, range Ab_86.3-88.7An_10.9-7.9Or_2.7-3.9, 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:

Credit	Photos
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)
jean bernard Delbauve
t.czarnecki
Public domain photographs:
A. Irving, UWS

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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