18 Nov
2009
18 Nov
'09
6:53 p.m.
I just remembered. It's rhenium.
$6000-*mumble* per ounce.
The most expensive thing I can think of is Boron -
specifically the purified B10 isotope. I once had a pair of
ancient neutron detector probes, with the inner surfaces
coated with the stuff. The price makes gold look like dog
food - $10K per gram, roughly.