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Noktat Addagmar
Basic information Name: Noktat Addagmar
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2006
Country: Mauritania
Mass:help 779 g
Classification
  history:
Meteoritical Bulletin:  MB 94  (2008)  LL5
Recommended:  LL5    [explanation]

This is 1 of 3148 approved meteorites classified as LL5.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 16 Dec 2008
Writeuphelp
Writeup from MB 94:

Noktat Addagmar                 25° 4209’’N, 10° 46 54’’W

Mauritania

Find: October or November 2006

Ordinary chondrite (LL5)

History: Two stones with a mass of 591 and 188 g, respectively (total known weight 779 g), were found by a Moroccan mineral collector (Sajid Ait Ben Chouk) near the caravansary of Noktat Addagmar after locals reported an abundance of “stones that recently fell from sky”, close to the track from Assa (Morocco) to Nouakchott (Mauritania).

Physical characteristics: The main mass is partly covered with a black fusion crust. The interior is greenish grey with slight rust haloes around metal. Porosity 8.2% based on alcohol absorption.

Petrography: (E. Gnos, MHNGE; B. Hofmann, NMBE, M. Eggimann, UBE/NMBE) Olivine Fa27.7 ± 0.6 (n = 27), pyroxene Fs23.1 ± 1.0 Wo1.6 ± 0.3. (n = 20). Shock stage is S2, some shock veins are visible, no weathering (W0). The mean diameter of chondrules is ~1 mm.

Cosmogenic radionuclides: (Patrick Weber, Particle Physics Group, Institute of Physics, University of Neuchâtel) Gamma-spectroscopy performed in December-January 2006 demonstrated the absence of short-lived radionuclides (no 22Na detected). The fall must have occurred at least several decades ago.

Classification: Ordinary chondrite (LL5), shock stage S2, no weathering (W0).

Type specimens: 22.4 g plus polished thin section at NMBE, main mass: Svend Buhl, Hamburg, Germany.

Data from:
  MB94
  Table 1
  Line 6:
State/Prov/County:Mauritania
Date:Oct-2006
Latitude:25°42'09"N
Longitude:10°46'54" W
Mass (g):779
Pieces:2
Class:LL5
Shock stage:S2
Weathering grade:W0
Fayalite (mol%):27.7
Ferrosilite (mol%):23.1
Wollastonite (mol%):1.6
Classifier:
Type spec mass (g):22.4
Type spec location:NMBE, E. Gnos, MHNGE; B. Hofmann, NMBE, M. Eggimann, UBE/NMBE
Main mass:SBuhl, Hamburg, Germany
Institutions
   and collections
NMBE: Natural History Museum Bern Bernastrasse 15 CH-3005 Bern Switzerland, Switzerland; Website (institutional address; updated 2 Mar 2012)
MHNGE: Muséum d’histoire naturelle, Route de Malagnou 1, CH-1211 Genève 6 , Switzerland (institutional address; updated 27 Oct 2011)
SBuhl: Meteorite Recon (Mr. S Buhl), Muehlendamm 86, 22087 Hamburg, Germany (private address; updated 14 May 2010)
UBE: University of Bern, University of Bern, Hochschulstrasse 4, CH-3012 Bern, Switzerland (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Svend Buhl      
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Alessandro Takeda   
Gerald Armstrong   
METEORITICON   
Woreczko Jan & Wadi   
Geography:

Mauritania
Coordinates:
     Recommended::   (25° 42' 9"N, 10° 46' 54"W)

Statistics:
     This is 1 of 9 approved meteorites from Tiris Zemmour, Mauritania (plus 1 impact crater)
     This is 1 of 114 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)
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