Most siderophile elements that accompany us here on top of the silicate Earth are in very low abundance. This is both bad and good, although mainly good. On the negative side, although the Earth is relatively rich in Au, ∼98 % of it resides in the core. Thus, if you like objects made of Au, its highly siderophile nature is bad because the paucity of Au that is accessible to humans makes it relatively precious. Also, from an analytical standpoint, the low abundances of many of the siderophile elements, in common rocks, have made them challenging to measure. Further, in...

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