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Northwest Africa 8720
Basic information Name: Northwest Africa 8720
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8720
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 77.1 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  R4
Recommended:  R4    [explanation]

This is 1 of 58 approved meteorites classified as R4.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)
Comments: Approved 2 Feb 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 8720 (NWA 8720)

Morocco

Purchased: Oct 2014

Classification: Rumuruti chondrite (R4)

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

Physical characteristics: One stone with black fusion crust. Cut surface reveals well defined chondrules scattered within a light-brown matrix.

Petrography: (A. Rubin and J. Breen, UCLA) Microprobe examination of a polished mount shows low-Ca pyroxene exhibits only minor polysynthetic twinning. Small grains of pyrrhotite are present. The rock is moderately recrystallized, consistent with type 4. The mean olivine Fa content indicates that it is an R chondrite. Mean chondrule size is ~400 μm, also consistent with R.

Geochemistry: Olivine, Fa38.5±0.3 (n=16); low-Ca pyroxene, Fs23.4±5.4Wo1.0±0.6 (n=10); Ca-pyroxene, Fs9.5Wo46.3 (n=2)

Classification: Rumuruti Chondrite (R4), Wi2 based on weathering index as published in Rubin and Huber (2005)

Specimens: 16.40 g on deposit at UCLA, A. Jonikas holds 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):77.08
Pieces:1
Class:R4
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):38.5±0.3 (n=16)
Ferrosilite (mol%):23.4±5.4
Wollastonite (mol%):1.0±0.6 (n=10)
Classifier:A. Rubin and J. Breen, UCLA
Type spec mass (g):16.40
Type spec location:UCLA
Main mass:A. Jonikas
Comments:AJ14-12; 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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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1406 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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