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Northwest Africa 11776
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:help 100.7 g
Classification
  history:
Recommended:  LL6-an    [explanation]

This is 1 of 3 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
Writeuphelp
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:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2017
Mass (g):100.7
Pieces:1
Class:LL6-an
Shock stage:S6
Weathering grade:W3
Fayalite (mol%):35.7±0.3
Ferrosilite (mol%):26.6±0.4
Wollastonite (mol%):1.9±0.3
Magnetic suscept.:3.88
Classifier:A. Love, App
Type spec mass (g):20.0
Type spec location:App
Main mass:PARI
Finder:Unknown
Comments:Submitted by Anthony Love
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Anthony Love      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6781 approved meteorites from (Northwest Africa) (plus 2047 unapproved names)

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