In a nutshell Scientists found pristine salt minerals in asteroid Bennu samples that formed in a specific sequence as ancient ...

To make that call, you need to look in on the process [IllyriaD] used to collect magnetite sand and turn ... changing the chemical composition by adding carbon and resulting in a gnarly lump ...

3). Whereas most magnetite-producing magnetotactic bacteria occur in a water column's oxic-anoxic transition zone, most iron-sulfide-producing magnetotactic bacteria occur in the anaerobic zone ...