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Northwest Africa 11772
Basic information Name: Northwest Africa 11772
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11772
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 38 g
Meteoritical Bulletin:  MB 107  (2018)  R5
Recommended:  R5    [explanation]

This is 1 of 40 approved meteorites classified as R5.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)
Comments: Approved 11 May 2018
Writeup from MB 107:

Northwest Africa 11772 (NWA 11772)

(Northwest Africa)

Purchased: 2014

Classification: Rumuruti chondrite (R5)

History: The meteorite was purchased from a local meteorite dealer in Zagora, Morocco.

Physical characteristics: Thirty eight small dark greyish fragments partly covered with fusion crust. Sawn surface shows a fresh greyish interior.

Petrography: The meteorite is a R-type breccia composed of up to 8 mm sized angular to subrounded clasts set into a more fine-grained clastic matrix. Chondrules are 100 μm to 1 mm with an average of about 350 μm. Fe-rich olivine is the most abundant mineral phase in all lithologies. More minor phases include low-Ca pyroxene, augite, pentlandite, and sodic plagioclase (mean grain size about 40 μm). No metal has been detected. All silicates are compositionally equilibrated.

Geochemistry: olivine: Fa38.2±0.3 (n=13, FeO/MnO=74-87);low-Ca pyroxene: Fs30.1±0.2Wo1.3±0.1 (n=11, FeO/MnO=47-58); augite: Fs12.0±0.3Wo44.3±0.4 (n=10, FeO/MnO=37-55)

Classification: R5 according to mineral chemistry and plagioclase grain size.

Data from:
  Table 0
  Line 0:
Place of purchase:Zagora, Morocco
Date:P 2014
Mass (g):38
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):38.2
Ferrosilite (mol%):30.1; 12.0
Wollastonite (mol%):1.3; 44.3
Classifier:A. Greshake, MNB
Type spec mass (g):7.6
Type spec location:MNB
Main mass:Stefan Ralew
Comments:Submitted by Ansgar Greshake
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 9370 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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