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Northwest Africa 10917
Basic information Name: Northwest Africa 10917
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10917
Observed fall: No
Year found: 2015
Country: Morocco
Mass:help 22 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  R3
Recommended:  R3    [explanation]

This is 1 of 33 approved meteorites classified as R3.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 3 Dec 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10917 (NWA 10917)

Morocco

Purchased: 2015 Oct

Classification: Rumuruti chondrite (R3)

History: Purchased by S. Arnold (of Chicago, Illinois) in October 2015 from Aziz Habibi. Subsequently sold to the owner in the same month. Likely recovered shortly before initial sale.

Physical characteristics: A single stone partially covered in a glossy, dark brown fusion crust. Saw cut reveals chondrules and clasts of variable size (up to ~2 mm) in a red-brown to grey matrix.

Petrography: (C. Herd, UAb) Microprobe and petrographic examination of thin section shows numerous chondrules in the range 150-1400 μm (most ~200-600 μm) comprising ~75% of mode (estimated). Fe-Ni sulfide and magnetite also observed. The rock does not appear to be brecciated.

Geochemistry: (C. Herd and S. Kampel, UAb) All olivine Fa39.3±6.1 (n=59); chondrule olivine Fa34.6±9.6, range Fa1.3-41.5 (n=18), matrix olivine Fa41.4±0.7 (n=41); low-Ca pyroxene Fs11.9±2.9, Wo0.5±0.2 (n=3); high-Ca pyroxene Fs10.8±1.4, Wo46.3±1.3 (n=7), plagioclase An6-17Or4-9 (n=4).

Classification: R3 chondrite, suggested sub-type 3.8, based on range of chondrule mineral compositions, and olivine-rich matrix. Range of chondrule sizes comparable to other R chondrites (e.g., Hammadah al Hamra 119; see Bischoff et al., 2011).

Specimens: A 6.8 g specimen, including one thin section, is at UAb. Main mass is with the owner.

Bibliography:
  • A. Bischoff, N. Vogel, and J. Roszjar (2011) The Rumuruti chondrite group. Chemie der Erde 71, 101-133. (link)
Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2015 Oct
Mass (g):22.0
Pieces:1
Class:R3
Shock stage:S2
Weathering grade:moderate
Fayalite (mol%):39.3±6.1 (n=59)
Ferrosilite (mol%):11.9±2.9 (n=3)
Wollastonite (mol%):0.5±0.2 (n=3)
Classifier:C. Herd, UAb
Type spec mass (g):6.8
Type spec location:UAb
Main mass:John Shea
Comments:Submitted by C. Herd
Institutions
   and collections
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1374 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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