Les trois type de météorites
THE METEORITES STONY
the chondrites and the achondrites
THE METEORITES MIXED
THE METEORITES METAL
the siderites and the pallasites
Here are the meteorites we work with:
The Siderites or planet’s hearts. Those iron-based meteorites are the nuclei of small planets or planetesimaux. And sometimes they fall on Earth.
Our first task is to find them.
Amongst these hearts of planet that eventually reach our Earth, a very small number only displays the special feature we look for.
With the naked eye one can see a network of bands we call the Widmanstätten pattern (or Thomson pattern). These patterns are the result of very long cooling period of about one degree per million years and they do not exist on earth (or on a microscopic scale only). Meteorites with this special feature are extremely rare.
The first fragment of Muonionalusta was found in 1906 in Sweden near the polar circle by two children playing. The first description can be dated back to 1910. It was named « Muonionalusta » after the nearby river Muonio around which it was found.
The Muonionalusta is probably the oldest meteorite known to man. It is hypothesized that it fell on earth around a million years ago.
It’s age coincides with that of the birth of the solar system, more or less 4,5 billion years.
This heart of planet is probably the oldest existing object on earth.