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| Northwest Africa 11776 | |||||||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 11776 This is an OFFICIAL meteorite name. Abbreviation: NWA 11776 Observed fall: No Year found: 2017 Country: (Northwest Africa) Mass:  100.7 g | ||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 6 approved meteorites classified as LL6-an. [show all] Search for other: LL chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||||||
| Comments: | Approved 15 Sep 2018 | ||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 107:
Northwest Africa 11776 (NWA 11776) (Northwest Africa) Purchased: 2017 Classification: Ordinary chondrite (LL6, anomalous) History: 1 stone weighing 100.7 g was found near Laayoune, Morocco, prior to 2017. J. Donald Cline and John Sinclair acquired the sample from a meteorite dealer at the Tucson Gem and Mineral Show in February of 2017. Physical characteristics: Sample is dark-orange-brown in color, irregularly shaped. The sample lacks fusion crust. The interior of the cut face shows a brecciated texture. Petrography: Description and Classification (A. Lov, App): Sample is a breccia composed of up to 1 cm angular recrystallized clasts of chondritic rock with barely discernible chondrules. All FeNi has been oxidized. Sulfides are partly altered. Average diameter of relict chondrules 1314 μm. Magnetic susceptibility log χ (× 10-9 m3/kg) = 3.88 (measured with a SM30 instrument). Geochemistry: (A. Love, App) Olivine (Fa35.7±0.3, N=8, Fe/Mn=69.6±1.0), low Ca pyroxene (Fs26.6±0.4Wo1.9±0.3, N=8). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O = 4.321, 4.476, 4.508; δ18O = 5.841, 6.144, 6.148; Δ17O = 1.237, 1.232, 1.262 (all per mil). Classification: Ordinary Chondrite (LL6-anomalous) S6 W3. The oxygen isotopes are in the LL range. Mean olivine and pyroxene compositions are outside the normal range for LL chondrites, hence the anomalous designation. Specimens: PARI holds the main mass. One endcut weighing 20.02 g and a polished thin section are on deposit at App. | ||||||||||||||||||||||||||||||||||
| Data from: MB107 Table 0 Line 0: |
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| Plots: | O isotopes: | ||||||||||||||||||||||||||||||||||
| Institutions and collections |
UNM: Institute of Meteoritics
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126
USA, United States; Website (institutional address; updated 12 Feb 2015) App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013) PARI: Pisgah Astronomical Research Institute 1 Pari Dr Rosman, NC 28772, United States (institutional address; updated 13 Sep 2016) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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| Photos: |
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| Geography: |
Statistics: This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names) | ||||||||||||||||||||||||||||||||||
| Crosslinks: |
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| Revision history: |
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