[meteorite-list] Met Bulletin Update - Braunschweig Approved - April 23, 2013 Fall

From: karmaka <karmaka-meteorites_at_meteoritecentral.com>
Date: Mon, 23 Sep 2013 22:45:45 +0200
Message-ID: <1VOD0r-09F3vE0_at_fwd50.aul.t-online.de>

Well, there was quite some excitement among meteorite aficionados
in Germany, but it's true that even in the German media this fall was almost not covered.

It's good to have witnessed another German fall after more than a decade.
It's unfortunate though that it shattered severely on impact.
 
Best regards
 
Martin
 
 
Von: "Galactic Stone & Ironworks" <meteoritemike at gmail.com>
 An: Meteorite List <meteorite-list at meteoritecentral.com>
 Betreff: [meteorite-list] Met Bulletin Update - Braunschweig Approved - April 23, 2013 Fall
 Datum: Mon, 23 Sep 2013 21:39:58 +0200
 
Hi Bulletin Watchers,
 
 Lost in all of the excitement about Chelyabinsk was the 04-23-13 fall
 of the Braunschweig L6 meteorite in Germany.
 
 Link - http://www.lpi.usra.edu/meteor/metbull.php?code=58083
 
 Write-up :
 
 Braunschweig 52?13.548?N, 10?31.193?E
 Niedersachsen, Germany
 Fell: 2013 Apr 23, 02:05 a.m.
 Classification: Ordinary chondrite (L6)
 
 History: (R. Bartoschewitz, Bart) Erhard Seemann recognized a rock
 impact in the concrete pavement in his yard 3 m from his front door
 when he came home on April 23, 2013, in the morning. He documented his
 observation and collected the main fragments (~700 g) of the nearly
 complete crushed stone. A neighbor heard a strong hum followed by a
 loud crash that night at about 2:10 a.m. In the morning he found
 several small rock fragments (~50 g) in his gateway. In Ahlum village,
 Julian Mascow was surprised by a bright flare coming from the SE,
 ending in a short tracer just over his head. About 90 s later he was
 frightened by an explosion and ensuing rattling sound around him. Mark
 Vornhusen?s web camera documented the fireball from Vechta. When
 Rainer Bartoschewitz documented the meteorite impact, he discovered
 many further small fragments (~500 g) within 18 m of the others.
 
 Physical characteristics: (R. Bartoschewitz, Bart) One meteorite
 individual of about 1.3 kg broken into hundreds of small fragments
 after impacting concrete pavement. The biggest fragment, 214 g, stuck
 in the concrete making a 7 cm diameter, 3 cm deep impression. Other
 fragments were <30 g. The gray-white meteorite material is covered by
 a 0.4 mm thick dull black fusion crust with abundant 50 ?m cracks.
 Magnetic susceptibility log ? = 4.75.
 
 Petrography: (R. Bartoschewitz, Bart) Recrystallized matrix of
 olivine, pyroxene (0.02-0.5 mm) and secondary feldspar bear poorly
 developed and deformed, dominantly barred olivine chondrules (0.5 to
 15 mm, av. 1.5 mm), metal, troilite and chromite. Dark metal-troilite
 veins (50 ?m) cross the meteorite. Olivine shows rather sharp
 extinction and irregular cracks.
 
 Geochemistry: (R. Bartoschewitz, Bart, P. Appel and B. Mader, Kiel)
 olivine Fa24.3-26.0 (mean Fa25.2?0.40, n=33); Ca-poor pyroxene
 Fs20.8-21.7Wo1.0-1.8 (mean Fs21.3?0.24Wo1.6?0.20, n=12); Ca-rich
 pyroxene Fs8.1-8.8Wo44.4-45.2 (mean Fs8.4?0.40Wo44.7?0.35, n=4);
 feldspar An11-18Or 4-10, chromite Cr/(Cr+Al)=88.3, Fe/(Fe+Mg)=79.8.
 Kamacite Ni=4.7-6.2, Co=1.0; taenite Ni=20-34, Co=0.3-0.7 (all in
 wt.%)
 
 Classification: L chondrite (L6, S4, W0)
 
 Specimens: Main mass of about 700 g, E. Seemann, Braunschweig; type
 specimen of 25 g, MKBraun; 500 g, Bart
 
 
 Best regards and happy huntings,
 
 MikeG
 
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Received on Mon 23 Sep 2013 04:45:45 PM PDT