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siderite Siberia Sikhote-Alin (5)

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  • Product Code: M20595
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Description

Origin : Russia (Sikhote-Alin- Primorsky Krai)

Geological era : Recent

Age : 1947

Size : 6.3 gr - mm 24 x 13 x 5


fragment of meteoric origin, 6.3 gr, mm 24 x 13 x 5, in plexiglas box diam. cm 3, only a piece as in pictures.
Iron octahedrite, class IIAB, falling period 12 Febr. 1947 in the homonymous Siberian region.

Included to the meteorite a comprehensive  geological tab dates paper (location, structural class, chemistry, age, history, etc.).

The Sikhote-Alin mountains, in eastern Siberia, are a mountain range of Russia, included in the two territories of Primorje and Khabarovsk. They extend for about 900 km in the direction of the meridians, culminating in Mount Anik at 1.933 m.
At 10:30 am on 12 February 1947, the mountains were affected by the fall of the largest meteorite whose fall was observed, one of the greatest meteorological rains in recent history. Many people in the area saw in the sky a big fireball brighter than the Sun. It came from the north and had a descending angle, then estimated, of about 41 degrees. The light and the powerful thunder of the fireball were perceived up to 300 km around the point of impact, not far from Luchegorsk and about 440 km northeast of Vladivostok. The trail of smoke of about thirty miles, remained in the Siberian sky for several hours before dissolving.
As it entered the atmosphere, at a speed of about 14 km / s, the meteoroid began to fragment. At an altitude of about 5.6 km the main mass, with a violent explosion, broke into a multitude of fragments which, before touching the ground, in turn fragmented into a succession of smaller explosions.
The fall created about 300 craters, the largest of which, now almost completely filled, had a diameter of about 27 meters and is 6 meters deep. The area of ​​the impact of this meteorite has, like many other areas of meteoric impact, an elliptical shape and extends for about 1.3 km².
Sikhote-Alin has been a massive meteoric rain and the known total mass (TKW) of 28 tons, already very high in itself, does not clearly take into account all the fragments that have not yet been found.
Krinov estimated the total post-atmospheric mass in about 70,000 kg. A more recent estimate made by Tsvetkov instead puts it around 100,000 kg.
Since the meteorite fell during the day, it was observed by numerous witnesses. This fact allowed Vasiliy Grigorievich Fesenkov, chairman of the Meteorite Committee of the Russian Academy of Sciences, to gather enough data to estimate the orbit of the meteoroid before its impact with the Earth. The orbit had an elliptical shape with an aphelion, or the furthest point from the Sun, located within the main asteroid belt. This orbit was most likely the result of a collision within the asteroid belt.
Sikhote-Alin is composed of 93% iron and 5.9% nickel. It also contains 0.42% cobalt, 0.46% phosphorus, 0.28% sulfur and traces of germanium and iridium. The main minerals present are: taenite, plessite, troilite, chromite, kamacite and schreibersite.



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