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Northwest Africa 8721
Basic information Name: Northwest Africa 8721
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8721
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 152.1 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  CK5
Recommended:  CK5    [explanation]

This is 1 of 169 approved meteorites classified as CK5.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 2 Feb 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 8721 (NWA 8721)

Morocco

Purchased: Oct 2014

Classification: Carbonaceous chondrite (CK5)

History: Purchased from a dealer in Morocco in October of 2014 by A. Jonikas.

Physical characteristics: One stone fragment with black fusion crust on one side. Cut surface reveals scattered chondrules within a grayish-brown matrix.

Petrography: (A. Rubin and J. Breen, UCLA) Microprobe examination of a polished mount shows plagioclase grains average 20 μm in size. The groundmass grain size is 70 μm, consistent with CK5. There are readily discernable chondrules and small rounded magnetite grains.

Geochemistry: Mineral compositions and geochemistry: olivine: Fa32.5±0.3 (n=18); there is no low-Ca pyroxene; Ca-pyroxene: Fs10.2±2.3Wo48.0±0.6 (n=5)

Classification: Carbonaceous Chondrite (CK5), Wi4 based on weathering index as published in Rubin and Huber (2005).

Specimens: 22.07 g on deposit at UCLA, A. Jonikas hold the main mass.

Bibliography:
  • Rubin A. E. and Huber H. (2005) A weathering index for CK and R chondrites. Meteorit. Planet. Sci. 40, 1123-1130. (link)
Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P Oct 2014
Mass (g):152.08
Pieces:1
Class:CK5
Shock stage:S2
Weathering grade:W4
Fayalite (mol%):32.5±0.3 (n=18)
Classifier:A. Rubin and J. Breen, UCLA
Type spec mass (g):22.07
Type spec location:UCLA
Main mass:A. Jonikas
Comments:AJ14-13; submitted by A. Jonikas
Institutions
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Alessandro Takeda   
John A. Shea   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1523 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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