A popular and easy method for validating whether or not a chunk of rock is a meteorite, and what kind of meteorite it is, has been inadvertently erasing invaluable information locked inside.
Scientists thought that it should retain a record of Mars' dynamo at this time, but when they went to check magnetic records in chunks of the rock,– not a trace. Whatever magnetic records of Mars remained in NWA 7034 after its journey to Earth had been obliterated by magnets used by meteorite hunters to verify their finds.
First, they calculated the size of a magnetic field around a hand magnet, and the effect that field would have on rocks of various sizes. Next, they tested the results of their calculations on chunks of Earth basalt, measuring the magnetization in the rock before and after exposure to a neodymium magnet.
The aforementioned 2014 study of NWA 7034 found the stone had been wiped, but the other fragments of the parent meteorite may still have retained traces of the original magnetic record. So the next step of the research was to test these other fragments. Sadly, Vervelidou and her team found that not a single one of the fragments had any trace of these records. They had all been completely erased.
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