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Boumdeid (2011)
Basic information Name: Boumdeid (2011)
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes
Year fell: 2011
Country: Mauritania
Mass:help 3.6 kg
Meteoritical Bulletin:  MB 102  (2013)  L6
Recommended:  L6    [explanation]

This is 1 of 12896 approved meteorites (plus 11 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 28 Mar 2013
Writeup from MB 102:

Boumdeid (2011)        17°10.496’N, 11°20.480’W

Assaba, Mauritania

Fell: 14 Sept 2011

Classification: Ordinary chondrite (L6)

History: A bright bolide was observed descending from the SSW by many eyewitnesses in the departments of Gorgol and Assaba. South of Bou Mdeid an explosion was heard, causing panic among the local population. Witnesses reported a terminal fragmentation of the fireball, sonic booms and hissing sounds. One mass was observed to impact and recovered the following morning. Agence Nouakchott d’Information issued a report on the event, S. Buhl published eye witness accounts recorded by C. Toueirjenne.

Physical characteristics: The stone is light gray with a black fusion crust. Some chondrules are visible on broken surface, and some rusty spots.

Petrography: A brecciated texture is evident in thin section, all components being of type L6. Strongly recrystallized texture. Feldspar grain size to 100 μm. Opaque phases include kamacite, taenite, troilite, chromite, ilmenite, and rare native copper. A single Cr-Al-rich chondrule (1.0 mm) with plagioclase (An25), spinel-chromite solid solution, ilmenite-geikielite and micron-sized baddeleyite is present in the analyzed thin section.

Geochemistry: Olivine has mean composition of Fa23.9±0.5 (identical value confirmed by XRD), pyroxene Fs20.2±0.4Wo1.6±0.3. Cosmogenic radionuclides (M. Laubenstein, Laboratori Nazionali del Gran Sasso, Italy): Gamma-ray spectroscopy conducted 84 days after the fall showed the presence of short-lived isotopes (7Be, 58Co, 56Co, 46Sc), consistent with a recent fall. Data for 60Co, 54Mn and 22Na indicate a pre-atmospheric radius of 10-20 cm.

Classification: Ordinary chondrite, L6 S2 W0.

Specimens: Type specimens: 53.6 g plus one polished thin section, NMBE; 807 g, SBuhl.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:Temporary nomad camp
Date:14 Sept 2011
Mass (g):3599
Shock stage:S2
Weathering grade:W0
Fayalite (mol%):23.9
Ferrosilite (mol%):20.2
Wollastonite (mol%):1.6
Classifier:B. A. Hofmann (NMBE), N. Greber (IFGBE)
Type spec mass (g):53.6
Type spec location:NMBE
Main mass:~1.6 kg were handed over to local authorities
Finder:Sidi Mohamed Ould Alharthi
Comments:Submitted by B. A. Hofmann
   and collections
NMBE: Natural History Museum Bern Bernastrasse 15 CH-3005 Bern Switzerland, Switzerland; Website (institutional address; updated 2 Mar 2012)
SBuhl: Meteorite Recon (Mr. S Buhl), Muehlendamm 86, 22087 Hamburg, Germany (private address; updated 14 May 2010)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     Recommended::   (17° 10' 30"N, 11° 20' 29"W)

     This is 1 of 2 approved meteorites from Assaba, Mauritania
     This is 1 of 224 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)
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