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Northwest Africa 11476
Basic information Name: Northwest Africa 11476
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11476
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 2.21 kg
Meteoritical Bulletin:  MB 106  (2018)  R3-4
Recommended:  R3-4    [explanation]

This is 1 of 11 approved meteorites classified as R3-4.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 24 Dec 2017
Writeup from MB 106:

Northwest Africa 11476 (NWA 11476)

(Northwest Africa)

Purchased: 2017

Classification: Rumuruti chondrite (R3-4)

History: The meteorite was bought from a local meteorite dealer in Morocco.

Physical characteristics: Three individuals partly covered by fusion crust and three sand blasted fragments lacking any fusion crust.

Petrography: The meteorite displays a dark-grayish interior and is composed of up to 4-cm sized mostly angular type 3 clasts and matrix; some clasts are dark brownish. The matrix is dominated by Fe-rich olivine and less abundant partly unequilibrated low-Ca pyroxene, augite and sodic feldspar. Olivine and low-Ca pyroxene in the clasts are highly unequilibrated. Chondrules are 100 to 900 µm with an average of about 400 µm. One spinel-rich chondrule has been found. Minor phases include pentlandite, sodic plagioclase, and Ca-pyroxene; no metal has been detected. The meteorite contains shock melt veins.

Geochemistry: olivine in matrix: Fa40.9±0.4, n=10; low-Ca pyroxene in matrix: Fs22.3±8.3Wo0.8±0.5 (Fs8.5-33.2Wo0.3-1.6, n=11); olivine in type 3 clasts: Fa29.5±12.3 (Fa1.1-45.1, n=26); low-Ca pyroxene in type 3 clasts: Fs16.6±10.2Wo2.0±1.1 (Fs4.5-34.2Wo0.5-4.4, n=22)

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017
Mass (g):2209
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):40.9±0.4 (n=10)
Ferrosilite (mol%):22.3±8.3 (n=11)
Wollastonite (mol%):0.8±0.5 (n=11)
Classifier:A. Greshake, MNB
Type spec mass (g):25.3
Type spec location:MNB
Main mass:Philippe Schmitt-Kopplin
Comments:Submitted by Ansgar Greshake
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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