Pirate Gold Coins Treasures of Space. Seymchan is a pallasite meteorite found in the dry bed of the river Hekandue, a left tributary of river Yasachnaya in the Magadan district, Russia, near the settlement of Seymchan, in June 1967. History The main mass of 272.3 kilograms (600 lb) was found during a survey in June 1967 by geologist F. The mass was a triangular-shaped thumbprinted meteorite lying among the stones of the brook bed. A second specimen of 51 kilograms (112 lb) was found with a mine detector at a distance of 20 m from the first in October 1967 by I.
The main mass was turned over to the Academy of Sciences of the USSR. During a new expedition in 2004, Dmitri Kachalin recovered about 50 kilograms (110 lb) of new material. Remarkably, about 20% of the new specimens were found to contain olivine crystals, and so revealed the silicated nature of the meteorite. The pallasitic structure was not previously discovered during studies on small metal-only sections of the original mass. Origin Pallasites were once thought to originate at the core-mantle boundary of differentiated asteroids that were subsequently shattered through impacts.
An alternative recent hypothesis is that they are impact-generated mixtures of core and mantle materials. [a] The Krasnoyarsk mass described by Pallas in 1776 was one of the examples used by E. Chladni in the 1790s to demonstrate the reality of meteorite falls on the Earth, which were at his time considered by most scientists as fairytales. This rock mass was dissimilar to all rocks or ores found in this area (and the large piece could not have been accidentally transported to the find site), but its content of native metal was similar to other finds known from completely different areas. This item is in the category "Collectibles\Rocks, Fossils & Minerals\Meteorites & Tektites".
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