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Northwest Africa 11779
Basic information Name: Northwest Africa 11779
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11779
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 669 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  L6
Recommended:  L6    [explanation]

This is 1 of 11997 approved meteorites (plus 6 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 19 Apr 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11779 (NWA 11779)

(Northwest Africa)

Purchased: 2012

Classification: Ordinary chondrite (L6)

History: Purchased by Tomasz Jakubowski from Moroccan dealer in 2012; 40 g was cut off and analyzed as one thin section on petrographic microscope in polarized and reflected light, other one thin section was analyzed on microprobe; 16.5 g of sample was powdered and bulk chemistry was analyzed by ICP MS

Physical characteristics: Single specimen with partly preserved fusion crust.

Petrography: (T.A. Przylibski, K. Luszczek UTWroc) Rare chondrules, most with gradual transition to matrix. Only a few chondrules have sharp edges. Chondrules are identified as: BO, RP, PO, GO, PP. Some of them have rims up to 0.2 mm thick. Chondrule diameters are from 0.5 to 1.9 mm, average 1.2 mm. Some chondrules are up to 2.7 mm in diameter. Mesostasis is crystallized and matrix is corse-grained with olivine crystals up to 0.5 mm in diameter. Also feldspar crystals are clearly visible and some of them are polysynthetically twinned. Feldspars are from 0.02 to 0.15 mm large. Opaque minerals (around 10 vol.%) include troilite, kamacite and taenite, and rare chromite.

Geochemistry: (R. Kryza WrocU; T.A. Przylibski, K. Luszczek, UTWroc) Olivine Fa24.9; pyroxene Fs19.4Wo1.3; chromite (Mg0.12 Fe2+0.71 Mn0.03 Zn0.01 Ti0.07)(Al0.25 Fe3+0.19 Cr1.56)O4; kamacite (5.7-6.7 wt%), taenite (up to 29.6 wt%), troilite without traces of Ni. Bulk chemistry (in wt%): Si 19.65, Al 1.19, Fe 18.45, Mg 15.51, Ca 1.52, Na 0.70, K 0.09, Ti 0.07, P 0.10, Mn 0.28, Cr 0.39, Ni 1.20, C 0.07, S 1.61; (in ppm) Ba 66, Co 306.7, Ga 4.6, Hf 13.9, Nb 0.8, Rb 2.1, Sn 18, Sr 24.7, V 74, Mo 0.8, Cu 82.1, Pb 0.2, Zn 20, Se 6.9, Zr 581.3, Au 126.5, Hg 0.11, Y 34.5, La 0.7, Ce 1.4, Pr 0.19, Nd 0.9, Sm 0.28, Eu 0.09, Gd 0.37, Tb 0.06, Dy 0.38, Ho 0.08, Er 0.22, Tm 0.03, Yb 0.2, Lu 0.03

Classification: Ordinary chondrite, L6, S1, W1

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2012
Mass (g):668.9
Pieces:1
Class:L6
Shock stage:S1
Weathering grade:W1
Fayalite (mol%):24.9
Ferrosilite (mol%):19.4
Wollastonite (mol%):1.3
Classifier:R. Kryza, T.A. Przylibski, K. Luszczek, T. Jakubowski, WTWroc
Type spec mass (g):40
Type spec location:USil
Main mass:Tomasz Jakubowski
Comments:Submitted by Katarzyna Luszczek
Institutions
   and collections
TM: Geoscience Museum, Transvaal Museum, P. O. Box 413, Pretoria 0001, South Africa (institutional address; updated 3 Mar 2011)
USil: Earth Sciences Museum, Institute of Earth Sciences, Faculty of Natural Sciences, University of Silesia in Katowice, B?dzi?ska 60, Sosnowiec, 41_200, Poland; Website (institutional address; updated 22 Nov 2020)
UTWroc: Wroclaw University of Technology, Faculty of Geoengineering Mining and Geology, Institute of Minings, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland (institutional address)
WrocU: Wroclaw University, Institute of Geological Sciences, ul. Cybulskiego 30, 50-205 Wroclaw, Poland (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8138 approved meteorites from (Northwest Africa) (plus 1941 unapproved names)

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