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Northwest Africa 11697
Basic information Name: Northwest Africa 11697
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11697
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 882 g
Meteoritical Bulletin:  MB 107  (2018)  R3-6
Recommended:  R3-6    [explanation]

This is 1 of 30 approved meteorites classified as R3-6.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 27 Mar 2018
Writeup from MB 107:

Northwest Africa 11697 (NWA 11697)

(Northwest Africa)

Purchased: 2017 Nov

Classification: Rumuruti chondrite (R3-6)

History: Purchased by Bob Falls in November 2017 from a dealer in Zagora, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed predominantly of small unequilibrated Type 3 lithic clasts (containing separated chondrules with apparent diameter 560±350 µm, N = 10) and related debris (including isolated chondrules), plus rare fine grained, recrystallized Type 5 and Type 6 chondrite clasts, in a finer grained matrix. Minerals in addition to olivine and pyroxenes include albitic plagioclase, pentlandite, troilite and minor ilmenite. Metal is absent. No CAI were observed in the studied thin section, but several chondrules were found to contain highly aluminous pyroxenes.

Geochemistry: Olivine in Type 3 clasts and isolated chondrules (Fa1.5-48.4, N = 4), orthopyroxene (Fs1.9-14.5Wo0.3-2.9, N = 3), augite (Fs10.7Wo45.4), Al-rich subcalcic clinopyroxene in chondrule (Fs3.5Wo29.2, Al2O3 = 7.7 wt.%, TiO2 = 1.0 wt.%), Al-rich diopside in chondrule (Fs1.8Wo41.9, Al2O3 = 7.7 wt.%, TiO2 = 0.9 wt.%), Al-rich low-Ca pyroxene in chondrules (Fs1.9-2.2Wo2.9-3.2, Al2O3 = 11.6-13.8 wt.%, TiO2 0.5-0.7 wt.%; Fs16.6Wo3.7, Al2O3 = 16.0 wt.%, TiO2 = 0.4 wt.%; N = 4), plagioclase (An6.5-10.0Or2.0-2.9, N = 2).

Classification: R3-6 chondrite. The high content of Mg-Tschermak’s component in low-Ca pyroxenes in some chondrules is an anomalous feature of this specimen.

Specimens: 20.5 g including one polished thin section at UWB; remainder with Mr. R. Falls.

Data from:
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2017 Nov
Mass (g):882.4
Shock stage:S2
Weathering grade:low
Fayalite (mol%):1.5-48.4
Ferrosilite (mol%):1.9-14.5
Wollastonite (mol%):0.3-2.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.5
Type spec location:UWB
Main mass:R. Falls
Comments:Work name BF17-19; 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)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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