Where is magnetite in mammalian brain?

[Andreas Jordan]

For magnetite in human brains, try : J.L. Kirschvink, et al., 
Proc.Natl.Acad.Sci. 89, pp.7683-7687, August 1992 "Magnetite 
biomineralization in the human brain" and related articles of the same 
first author.CIAO.Howard Olson wrote:
> 
>     I understand the rat brain has magnetite crystals (BTW can anyone
> give me a reference?) . Where is it found? Could it be in the
> substantia nigra?
>                         Howard