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Northwest Africa 10191
Basic information Name: Northwest Africa 10191
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10191
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 4.26 kg
Meteoritical Bulletin:  MB 104  (2015)  C3
Recommended:  C3    [explanation]

This is 1 of 3 approved meteorites classified as C3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), and Ungrouped chondrites
Comments: Approved 30 Jun 2015
Writeup from MB 104:

Northwest Africa 10191 (NWA 10191)

(Northwest Africa)

Purchased: 2014

Classification: Carbonaceous chondrite (C3)

History: Purchased by Darryl Pitt over the period May 2014 to March 2015 from the same dealer in Erfoud, Morocco (and reportedly found at the same site as NWA 8418).

Physical characteristics: A group of nine uncrusted stones (total weight 4262 g) of very similar appearance. All contain visible metal and sporadic, relatively large, round CAI rimmed by chlorapatite.

Petrography: (A. Irving and S. Kuehner, UWS) A sample from each stone was analyzed by optical petrographic and electron microprobe techniques applied to thin sections or polished slices. All specimens are relatively fresh and composed of small to large (apparent diameter 0.15-3.9 mm), separated granular chondrules in a finer grained metal-bearing matrix. Chlorapatite occurs patchily throughout the matrix of every specimen. Large (up to 5.5 mm), coarse grained CAI composed of olivine, Al-Ti-diopside, spinel and ilmenite occur sporadically, and are rimmed by chlorapatite; much finer-grained CAI with the same mineral assemblage are also present in some specimens.

Geochemistry: Olivine (Fa0.4-37.6, FeO/MnO = 108-135, N = 7), orthopyroxene (Fs0.9-19.3Wo0.9-1.5, N = 3), augite (Fs6.7-7.8Wo48.7-47.3, N = 2).

Classification: Carbonaceous chondrite (C3) with affinities to CV3 chondrites. The abundance of apatite in this specimen is an anomalous feature for carbonaceous chondrites. This and the presence of large rimmed CAI establish that these stones are paired with the NWA 8418 stone found at the same site.

Specimens: 65.4 g including four polished thin sections and six polished slices or endcuts at UWB. The remaining material is held by DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2014
Mass (g):4262
Shock stage:S2
Weathering grade:low
Fayalite (mol%):0.4-37.6
Ferrosilite (mol%):0.9-19.3
Wollastonite (mol%):0.9-1.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):65.4
Type spec location:UWB
Main mass:DPitt
Comments:DP14-3, MAC 93, MAC 94, MAC 95, etc.; submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
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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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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