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| Northwest Africa 11772 | |||||||||||||||||||||||||||||||
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| 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:  38 g | ||||||||||||||||||||||||||||||
| Classification history: |
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 |
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: MB107 Table 0 Line 0: |
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| Institutions 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) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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| Geography: |
Statistics: This is 1 of 9370 approved meteorites from (Northwest Africa) (plus 1875 unapproved names) | ||||||||||||||||||||||||||||||