Yes do, if you enjoy the discussion -- otherwise, don't feel obliged.
"Historically" is a good-enough answer for the "why gold" for me.
Thanks also for the distinction between the place-holding function of money
and money as a measure of value. I can see that the gold is, somehow, used
to fix this measure, to keep it in place, so to speak. On the other hand,
what happened to the "socially necessary labour time" as the measure of
value?
Eva