Those meteorites are fragments of "non-differentiated
parent bodies". They have not been modified since creation
of the solar system and thanks to isotopic analyses carried out
on those meteorites, scientists have been able to measure the
age of the solar system (and of the Earth as well), as 4.5 billion
The name "Chondrite" comes from the name
of the small spheres that they contain, the chondrules, that can
never be found in the structure of any terrestrial stone.