Chebarkul meteorite fragment seen through a microscope in polarised light. This research is being carried out at the Vernadsky Institute, Moscow, Russia. The meteoroid and meteor (Chelyabinsk Event) that produced this and other meteorite fragments occurred at around 09:20 local time (03:20 UTC) on 15 February 2013 over Russia's Chelyabinsk region. The meteoroid weighed several thousand tons, reaching an altitude of around 20 kilometres before exploding in an airblast. Most fragments found so far are less than a few centimetres across. Photographed on 28 February 2013.
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