[meteorite-list] Chelyabinsk classified as type LL5, S4

[Ron Baalke]

> 
> Dear list members,
>  
> Chelyabinsk has been classified as type LL5, S4 in a first analysis.
>  
> Source: http://ria.ru/science/20130228/925165413.html?ria=pkqvb5h7dp1l9h1sm6fau2memqs9jakp
>  
> Martin
> 


Note: This is the English version translated from Russian

http://ria.ru/science/20130228/925165413.html

Chelyabinsk type meteorite was unique for Russia - scientists
RIA Novosti
February 28, 2013

MOSCOW, Feb. 28 - RIA Novosti. Experts Moscow laboratory Meteoritics 
finished their primary research on fragments of a meteorite that 
fell near Chelyabinsk in mid-February. As it turned out, this type of 
meteorites have never found on the territory of Russia, RIA Novosti, 
Mikhail Nazarov, head of the laboratory.

February 15 morning residents of several regions of the Urals observed the meteor, 
and then there was a flash and a powerful explosion . The shock wave damaged 
buildings and knocked out a lot of glass in Chelyabinsk, and more than a 
thousand people were injured. A Ural Federal University expedition discovered earlier 
in Lake Chebarkul meteorite particles, and chemical analysis showed that in the Urals 
were ordinary chondrites - a type of stony meteorite.

Expedition laboratory Meteoritics Institute of Geochemistry and Analytical Chemistry, 
Russian Academy of Sciences Vernadsky delivered to Moscow about 1.5 kilograms of 
meteorite fragments. According to Nazarov, to date, the first phase of the research 
of submitting an application of the meteorite to the international catalog have 
been completed.

"This is an ordinary chondrite type LL5, shock fraction S4. Such meteorites are 
relatively rare, in the flow of ordinary chondrites are only about 2%. Our territory 
of previously observed," - said the source.

LL chondrites are low in iron and other metals, as well as relatively large 
chondrules (rounded "grains", which got its name: chondrites). Figure 5 is a 
petrological class, indicating the kind of geochemical changes undergone a 
meteorite. In Russia, this type of of meteorite has never been found before.